Lawmakers on the House Homeland Security subcommittee were privately shown videotapes of Gulf and Los Zetas cartel members carrying out attacks against military and law enforcement, the San Antonio Express-News reported Thursday.
One video showed cartel members using grenade launchers and assault rifles with military precision to take over a roadside checkpoint in Camargo.
Both House and Senate chambers are crafting bills for border security next year and expanding the three-year, $1.4 billion Merida Initiative designed to help the Mexican military battle the cartels.
Rep. Michael McCaul, R-Texas, chairman of the House Homeland Security subcommittee on investigations, filed a bill to criminalize cartels as terrorist organizations.
"It is time for the United States to take decisive steps to end a rampant war that is just south of our border. The solution goes well beyond securing our borders," McCaul said.
Drug-related violence has risen in Mexico significantly since Mexican President Felipe Calderón launched his crackdown on the cartels in 2006.