More than two dozen people have been hurt in two separate attacks on buses in the Colombian capital, Bogota.
Authorities are investigating whether the bombings were the work of leftist rebels.
The first explosion took place Thursday afternoon in Ingles, a working class neighborhood of southern Bogota. The second occurred in the La Florida neighborhood. Both attacks were on Transmilenio bus lines.
Witnesses at the scene said they saw people running from the buses in flames, and that several of the passengers were children. Many of the injured are said to have serious burns.
Police say the attacks were likely the work of Columbia's largest rebel group, the Revolutionary Armed Forces, or FARC, which has been trying to overthrow the government for more than four decades. That conflict has left thousands dead.
Some information for this report was provided by AP.