Mexico City ? Eleven federal agents were charged with kidnapping for picking up four alleged drug hit men and possibly helping kill them, the Mexican Attorney General’s office said Thursday.

At least one of the presumed hit men was shot in the head, a killing recorded on a homemade DVD, excerpts of which were published Thursday on the Web sites of The Dallas Morning News and the Kitsap Sun, a newspaper in Bremerton, Wash.

Mexico’s top anti-drug prosecutor, Jose Luis Vasconcelos, said the DVD was likely to spark a new wave of violence among traffickers looking to settle personal scores. The DVD killing was likely carried out as part of a dispute by rival drug gangs, Vasconcelos said.

Mexican officials said Thursday they have known about the DVD for months. The men shown on the video are purported hit men for the Gulf Cartel.

The excerpts show four men sitting bruised, bloody and bound before a curtain of black garbage bags. Prodded by an unseen interrogator, they describe themselves as hit men for the Gulf Cartel, detailing how they kidnapped, tortured and killed their enemies, including a radio reporter, the Morning News reported.