People gather at the explosion site in Bogota July 2, 2015. Two explosions took place in the Colombian capital on Thursday, leaving five people injured. (Xinhua/Colprensa)

People gather at the explosion site in Bogota July 2, 2015. Two explosions took place in the Colombian capital on Thursday, leaving five people injured. (Xinhua/Colprensa)

People gather at the explosion site in Bogota July 2, 2015. Two explosions took place in the Colombian capital on Thursday, leaving five people injured. (Xinhua/Colprensa)

People gather at the explosion site in Bogota July 2, 2015. Two explosions took place in the Colombian capital on Thursday, leaving five people injured. (Xinhua/Colprensa)

People gather at the explosion site in Bogota July 2, 2015. Two explosions took place in the Colombian capital on Thursday, leaving five people injured. (Xinhua/Colprensa)

People gather at the explosion site in Bogota July 2, 2015. Two explosions took place in the Colombian capital on Thursday, leaving five people injured. (Xinhua/Colprensa)

People gather at the explosion site in Bogota July 2, 2015. Two explosions took place in the Colombian capital on Thursday, leaving five people injured. (Xinhua/Jhon Paz)

Firefighters work at the explosion site in Bogota July 2, 2015. Two explosions took place in the Colombian capital on Thursday, leaving five people injured. (Xinhua/Jhon Paz)

Firefighters work at the explosion site in Bogota July 2, 2015. Two explosions took place in the Colombian capital on Thursday, leaving five people injured. (Xinhua/Jhon Paz)

Firefighters work at the explosion site in Bogota July 2, 2015. Two explosions took place in the Colombian capital on Thursday, leaving five people injured. (Xinhua/Jhon Paz)

A policeman stands guard at the explosion site in Bogota July 2, 2015. Two explosions took place in the Colombian capital on Thursday, leaving five people injured. (Xinhua/Jhon Paz)