At least four people were killed in Colombia as rebel groups detonated bombs near police stations in the city of Cali and the neighboring Cauca province, according to Colombian authorities.

A wave of explosions has rocked southern Colombia, killing one and injuring nine in the city of Cali. Authorities say there were also attacks on police posts in nearby towns.At least two people were killed on Tuesday after a string of bomb explosions targeted police posts in the southwestern Colombian city of Cali,

Authorities are also responding to other explosion sites, sources from the Cali Metropolitan Police confirmed to CNN. Several people were injured in the explosions, the sources said.