The former rebel commander and top peace negotiator known as Jesus Santrich is accused of conspiring to smuggle $15 million worth of cocaine into the U.S.
It is the second time this month negotiations have been put on hold after insurgents launched a series of bomb attacks on police targets. It is unclear when negotiations will resume.
After more than 50 years of insurgency, Colombia's most notorious leftist militant group has handed over its guns and formed a political party that's now fielding its first election candidates.
A peace treaty in 2016 largely ended a half-century war waged by the guerrilla group FARC against Colombia's government. But a handful of FARC dissidents extort business owners and refuse to disarm.
A peace agreement with the leftist rebel group FARC was narrowly rejected in a national referendum in October. This new deal was renegotiated and submitted to Colombia's Congress, bypassing voters.
Nearly two months after Colombians voted to reject a peace accord, the two sides have signed a modified agreement to end more than 50 years of conflict.
Just six weeks ago, Colombian voters rejected an agreement that would have brought an end to the 52-year guerrilla war. Now, both sides have announced another attempt at peace.
FARC rebels are awaiting the day when they can put down their weapons. In the meantime, they've become more sedentary. Some guerrillas have gained weight from inactivity. Others are expecting babies.
FARC rebels are wondering whether they might be called back again into combat. Many hope not. After voters rejected a peace deal, "I could feel all my dreams falling apart," says one.
Colombian President Juan Manuel Santos is trying to salvage a peace agreement to end the 52-year-old guerrilla war that was narrowly rejected in a nationwide referendum.