Official: Base shooter watched shooting videos before attack

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An Air Force carry team moves a transfer case containing the remains of Seaman Apprentice Cameron Scott Walters, Sunday, Dec. 8, 2019, at Dover Air Force Base, Del. A Saudi gunman killed three people including Walters, of Richmond Hill, Ga., in a shooting at Naval Air Station Pensacola in Florida. (AP Photo/Cliff Owen)

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FILE- In this Jan. 29, 2016 file photo shows the entrance to the Naval Air Base Station in Pensacola, Fla. The US Navy is confirming that an active shooter and one other person are dead after gunfire at the Naval Air Station in Pensacola. Area hospital representatives tell The Associated Press that at least 11 people were hospitalized. The base remains locked down amid a huge law enforcement response. (AP Photo/Melissa Nelson, File)

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This undated photo provided by the U.S. Navy shows Ensign Joshua Kaleb Watson, from Coffee, Ala. Family members on Saturday identified one of the victims of a shooting at Naval Air Station Pensacola, Fla., as Watson, a 23-year-old recent graduate of the U.S. Naval Academy who alerted first responders to where the shooter was even after he had been shot several times. (U.S. Navy via AP)

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This undated photo provided by the U.S. Navy shows Airman Mohammed Sameh Haitham, from St. Petersburg, Fla. One of the victims of the shooting Friday, Dec. 6, 2019, at Naval Air Station Pensacola, Fla., has been identified as Haitham, 19, who joined the Navy after graduating from high school last year, according to the Tampa Bay Times. (U.S. Navy via AP)

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CORRECTS ONE OF THE DUPLICATIONS OF WALTERS TO WATSON - An Air Force carry team marches away from the transfer cases containing the remains of Ensign Cameron Joshua Kaleb Watson, Seaman Mohammed Sameh Haitham and Seaman Apprentice Cameron Scott Walters, Sunday, Dec. 8, 2019, at Dover Air Force Base, Del. A Saudi gunman killed the three people in a shooting Friday at Naval Air Station Pensacola in Florida. (AP Photo/Cliff Owen)

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A vehicle drives by a tribute to victims of the Naval Air Station Pensacola that was freshly painted on what’s known as Graffiti Bridge in downtown Pensacola, Fla., on Saturday, Dec. 7, 2019. A US official says the Saudi student who fatally shot three people at the Florida naval base had hosted a dinner party earlier in the week to watch videos of mass shootings. The official spoke on condition of anonymity after being briefed by federal investigators. The official says a second Saudi student was recording outside the building at the Naval Air Station Pensacola on Friday while the shooting was happening inside. The official also says 10 Saudi students are being held at the base and that several others are unaccounted for. (AP Photo/Brendan Farrington)

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A man reads the daily Al-Madina newspaper fronted by a picture of Saudi King Salman at a coffee shop in Jiddah, Saudi Arabia, Saturday, Dec. 7, 2019. U.S. law enforcement officials were digging into the background of the suspected Florida naval station shooter Friday, to determine the Saudi Air Force officer's motive and whether it was connected to terrorism. Arabic reads "King Salman to Donald J. Trump: Florida shooter does not represent the Saudi people." (AP Photo/Amr Nabil)

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A man reads the daily Al-Madina newspaper fronted by a picture of Saudi King Salman at a coffee shop in Jiddah, Saudi Arabia, Saturday, Dec. 7, 2019. U.S. law enforcement officials were digging into the background of the suspected Florida naval station shooter Friday, to determine the Saudi Air Force officer's motive and whether it was connected to terrorism. Arabic at top reads "King Salman to Donald J. Trump: the Florida shooter does not represent the Saudi people." (AP Photo/Amr Nabil)

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Saudi daily Al-Madina newspaper fronted by a picture of Saudi King Salman is displayed at a coffee shop in Jiddah, Saudi Arabia, Saturday, Dec. 7, 2019. U.S. law enforcement officials were digging into the background of the suspected Florida naval station shooter Friday, to determine the Saudi Air Force officer's motive and whether it was connected to terrorism. Arabic reads "King Salman to Donald J. Trump: Florida shooter does not represent the Saudi people." (AP Photo/Amr Nabil)

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This undated photo provided by the FBI shows Mohammed Alshamrani. The Saudi student opened fire inside a classroom at Naval Air Station Pensacola on Friday before one of the deputies killed him. (FBI via AP)

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This undated photo provided by the U.S. Navy shows Ensign Joshua Kaleb Watson, from Coffee, Ala. Family members on Saturday identified one of the victims of a shooting at Naval Air Station Pensacola, Fla., as Watson, a 23-year-old recent graduate of the U.S. Naval Academy who alerted first responders to where the shooter was even after he had been shot several times. (U.S. Navy via AP)

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This undated photo provided by the U.S. Navy shows Airman Mohammed Sameh Haitham, from St. Petersburg, Fla. One of the victims of the shooting Friday, Dec. 6, 2019, at Naval Air Station Pensacola, Fla., has been identified as Haitham, 19, who joined the Navy after graduating from high school last year, according to the Tampa Bay Times. (U.S. Navy via AP)

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In this Nov. 22, 2019 photo provided by the Walters Family, Cameron Walters, center in Navy uniform, poses for a photo with his sisters, Lily Walters, left, and Shania Walters, right, and his father, Shane Walters, far right, the day he graduated from boot camp in Great Lakes, Ill. Cameron Walters, 21, of Richmond Hill, Georgia, was among three sailors killed at Naval Air Station Pensacola in Florida on Friday, Dec. 6. (Heather Walters/Courtesy of the Walters Family via AP)

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In this Nov. 22, 2019 photo provided by the Walters Family, Cameron Walters, center in Navy uniform, poses for a photo with his sisters, Lily Walters, left, and Shania Walters, right, and his father, Shane Walters, far right, the day he graduated from boot camp in Great Lakes, Ill. Cameron Walters, 21, of Richmond Hill, Georgia, was among three sailors killed at Naval Air Station Pensacola in Florida on Friday, Dec. 6. (Heather Walters/Courtesy of the Walters Family via AP)

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CORRECTS ONE OF THE DUPLICATIONS OF WALTERS TO WATSON - Air Force Door Attendant Staff Sgt. Siannie Conception closes the door of the transfer vehicle carrying the transfer cases containing the remains of Ensign Cameron Joshua Kaleb Watson, Seaman Mohammed Sameh Haitham and Seaman Apprentice Cameron Scott Walters, Sunday, Dec. 8, 2019, at Dover Air Force Base, Del. A Saudi gunman killed the three people in a shooting at Naval Air Station Pensacola in Florida. (AP Photo/Cliff Owen)

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CORRECTS ONE OF THE DUPLICATIONS OF WALTERS TO WATSON - Air Force Door Attendant Staff Sgt. Siannie Conception closes the door of the transfer vehicle carrying the transfer cases containing the remains of Ensign Cameron Joshua Kaleb Watson, Seaman Mohammed Sameh Haitham, and Seaman Apprentice Cameron Scott Walters, Sunday, Dec. 8, 2019, at Dover Air Force Base, Del. A Saudi gunman killed the three people in a shooting at Naval Air Station Pensacola in Florida. (AP Photo/Cliff Owen)

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CORRECTS ONE OF THE DUPLICATIONS OF WALTERS TO WATSON - An Air Force carry team salutes the transfer cases containing the remains of Ensign Cameron Joshua Kaleb Watson, Seaman Mohammed Sameh Haitham and Seaman Apprentice Cameron Scott Walters, Sunday, Dec. 8, 2019, at Dover Air Force Base, Del. A Saudi gunman killed the three people in a shooting at Naval Air Station Pensacola in Florida. (AP Photo/Cliff Owen)

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CORRECTS ONE OF THE DUPLICATIONS OF WALTERS TO WATSON - Air Force Col. G. Brian Eddy, left, and Acting Navy Secretary Thomas Modly take part in the dignified transfer for Ensign Cameron Joshua Kaleb Watson, Seaman Mohammed Sameh Haitham and Seaman Apprentice Cameron Scott Walters, Sunday, Dec. 8, 2019, at Dover Air Force Base, Del. A Saudi gunman killed the three people in a shooting Friday at Naval Air Station Pensacola in Florida. (AP Photo/Cliff Owen)

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CORRECTS ONE OF THE DUPLICATIONS OF WALTERS TO WATSON - Acting Navy Secretary Thomas Modly, left, and Navy Adm. Michael Gilday, Chief of Naval Operations, participate in the dignified transfer for Ensign Cameron Joshua Kaleb Watson, Seaman Mohammed Sameh Haitham and Seaman Apprentice Cameron Scott Walters, Sunday, Dec. 8, 2019, at Dover Air Force Base, Del. A Saudi gunman killed the three people in a shooting Friday at Naval Air Station Pensacola in Florida. (AP Photo/Cliff Owen)

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CORRECTS ONE OF THE DUPLICATIONS OF WALTERS TO WATSON - Air Force Col. G. Brian Eddy, from left, Navy Adm. Michael Gilday, Chief of Naval Operations, and Acting Navy Secretary Thomas Modly pause for prayer at the ramp of the Air Force cargo plane carrying the transfer cases containing the remains of Ensign Cameron Joshua Kaleb Watson, Seaman Mohammed Sameh Haitham and Seaman Apprentice Cameron Scott Walters, Sunday, Dec. 8, 2019, at Dover Air Force Base, Del. A Saudi gunman killed the three people in a shooting Friday at Naval Air Station Pensacola in Florida. (AP Photo/Cliff Owen)

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CORRECTS ONE OF THE DUPLICATIONS OF WALTERS TO WATSON - Air Force Col. G. Brian Eddy, from left, Navy Adm. Michael Gilday, Chief of Naval Operations, and Acting Navy Secretary Thomas Modly pause for prayer at the ramp of the Air Force cargo plane carrying the transfer cases containing the remains of Ensign Cameron Joshua Kaleb Watson, Seaman Mohammed Sameh Haitham and Seaman Apprentice Cameron Scott Walters, Sunday, Dec. 8, 2019, at Dover Air Force Base, Del. A Saudi gunman killed the three people in a shooting Friday at Naval Air Station Pensacola in Florida. (AP Photo/Cliff Owen)

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CORRECTS ONE OF THE DUPLICATIONS OF WALTERS TO WATSON - An Air Force carry team pays respect after moving a transfer cases containing the remains of Ensign Cameron Joshua Kaleb Watson, Seaman Mohammed Sameh Haitham and Seaman Apprentice Cameron Scott Walters, Sunday, Dec. 8, 2019, at Dover Air Force Base, Del. A Saudi gunman killed the three people in a shooting Friday at Naval Air Station Pensacola in Florida. (AP Photo/Cliff Owen)