Top Republican lawmakers stepped up their demand Sunday for the Obama administration to provide more hard evidence about what happened during the fatal attacks on U.S. outposts in Benghazi, Libya, including information gathered from drones flying overhead during the terror strikes.

In addition to requesting videos from the drones, the lawmakers also are asking the administration to reveal whether the unmanned craft had weapons and to declassify videos recorded inside the U.S. Consulate in Libya where Ambassador Christopher Stevens and State Department Official Sean Smith were killed.

The lawmakers hope such evidence will in part finally prove whether a mob indeed assembled before the strike. Hours later, two former Navy SEALs were killed during an attack on a nearby CIA annex.