U.S. Attorney General Richard Thornburgh, finishing a three-day fact-finding mission in Peru, Bolivia and Colombia, said Thursday he was searching for ways "to break the back of drug trafficking."

"I have made this trip at the request of President (George) Bush to reinforce our working relationship with these countries and to convey the United States commitment to hold users in our country accountable for the drug problem," Thornburgh said.Thornburgh met for nearly two hours with President Virgilio Barco and Colombian anti-narcotics officials before returning to Washington Thursday night.

"One of the reasons for the trip has been to gather information that will allow the United States together with Bolivia, Peru and Colombia to devise ways to break the back of drug trafficking," Thornburgh said at a news conference at the U.S. Embassy.