Seven people were killed and some 50 injured in a bomb blast in northwest Colombia, police said on Saturday.
The explosion occurred on Thursday night in front of a discotheque in central Ituango city of Antioquia province.
The injured were taken by helicopter to Antioquia's capital Medellin early on Friday.
Police suspected the El Pajaro armed group, a faction of the leftist Revolutionary Armed Forces of Colombia (FARC), was responsible for the attack.
A person, allegedly involved in engineering the blast, has been detained, police said.