Colorado Gov. John Hickenlooper held an 11-minute conference call with U.S. Attorney General Eric Holder on Friday in an attempt to gauge how the federal government will respond to Colorado's legalization of marijuana.

The governor's office provided few details on the call and didn't indicate whether any agreements were reached. State Attorney General John Suthers also participated in the call, which took place a little after 3 p.m.

"They emphasized the need for the federal government to articulate what its position will be related to Amendment 64," Hickenlooper's spokesman, Eric Brown, said in a statement. "Everyone shared a sense of urgency and agreed to continue talking about the issue."

Amendment 64, which Colorado voters approved Tuesday with 55 percent support, legalizes possession of up to an ounce of marijuana for any purpose for people ages 21 and older and also allows specially licensed stores to sell marijuana starting in 2014.

U.S. Justice Department officials, who consider all marijuana possession and sales illegal under federal law, have said they will continue their enforcement efforts regardless of state law but have been vague on specifics.

John Ingold: 303-954-1068, jingold@denverpost.com or twitter.com/john_ingold