The Colombian government says it is suspending Peace Talks with the National Liberation Army (ELN), a left-wing rebel group.
The government says that the group was behind the three bombings.
The group has admitted carrying out the worst attack but not the others. The Colombian defence minister said that all three attacks were related.
Colombian President Juan Manuel Santos said talks were being suspended because of a "lack of coherence on the part of the ELN between its words and actions".