The Senate Judiciary Committee on Thursday announced an investigation into the New Orleans terrorist attack that left 15 people dead on New Year’s Day, as well as the explosion outside the Trump hotel in Las Vegas that left the perpetrator dead on the same day.

Committee Chairman Chuck Grassley, R-Iowa, and Permanent Subcommittee on Investigations Chairman Ron Johnson, R-Wis., sent letters to the Justice Department, Department of Homeland Security, Department of Defense and the FBI requesting more information about New Orleans attacker Shamsud-Din Jabbar’s background and motive.

They are also requesting more information from Meta about Jabbar’s Facebook activity leading up to the deadly, planned attack, noting that the Texas native motivated by ISIS extremism posted five videos to his Facebook page hours before he drove a truck through New Year’s revelers on Bourbon Street.

“The public deserves complete transparency and the truth regarding the New Orleans terrorist attack and the Las Vegas car explosion,” the chairmen wrote. “While we understand the investigation into both of these incidents is ongoing, we expect your agencies to be forthcoming and responsive to oversight requests from Congress on this very serious matter.”

The FBI continues to investigate the Bourbon Street attack.

Jabbar had visited New Orleans on two occasions prior to the Jan. 1 attack — once on Oct. 30, 2024, and again on Nov. 10, 2024. The terrorist also visited Cairo, Egypt, and Toronto, Canada, prior to the attack, the FBI said.

While Jabbar apparently acted alone, authorities are still investigating whether he had any accomplices.