Colombian police say they 've detained four suspects tied to DEA agent 's killing . `` We will never forget Special Agent Watson and his sacrifice , as well as all those who have given their lives for the rule of law . The men were arrested in the city of Cali, where a U.S. Drug Enforcement Administration official was killed last week by suspected assassins who had been tipped off about his plans for an operation against drug traffickers. Two more suspects are at large , a CNN affiliate reports . The agent was killed in a robbery attempt ; officials do not believe it was tied to his work .
Colombian police say they 've detained four suspects tied to DEA agent 's killing . The men were arrested in the city of Cali, where a U.S. Drug Enforcement Administration official was killed last week by suspected assassins who had been tipped off about his plans for an operation against drug traffickers. Two more suspects are at large , a CNN affiliate reports . The agent was killed in a robbery attempt ; officials do not believe it was tied to his work .