The Colombian government says that the ELN rebel group was responsible for the car bomb attack on a police academy in Bogota on Thursday. The attack killed at least 21 and injured dozens. The ELN has not released a statement or claimed responsibility for the attack. FRANCE 24 spoke to Kyle Johnson, a Colombia expert at the International Crisis Group, an NGO that carries out research on international conflict. He told FRANCE 24 that the attack reflects “internal tensions” within the group.