A US missionary has been detained for alleged collaboration with Colombia’s main leftist rebel group, authorities said on Thursday.

Police Col Flavio Meza said Martin Stendal, a 59-year old native of Minnesota, surrendered on Wednesday night to face an arrest warrant charging him with supporting terrorism and collaborating with the Revolutionary Armed Forces of Colombia rebel movement.

Police allege that Stendal, who lives in Colombia, traveled to Cuba and Panama as a messenger for the guerrillas.

Stendal says in a video posted online that he had been set up and that his trips into rebel territory to distribute Bibles and radios were only for ministering.

“Somebody set a trap for me, and I walked into it,” he said. “There was a secret order out for my arrest.”

Since 2012, the peasant-based Farc has been in peace talks in Havana aimed at ending a half-century-old conflict.