At least 10 people, including two minors, were injured on Tuesday when a bomb exploded in Colombia's Pacific port city of Buenaventura.
Police told Colombia's RCN radio that the bomb was thrown into a grocery store in the Jorge Eliecer Gaitan area of Buenaventura, in Del Valle province.
The injured have been taken to hospital and one was in serious condition, the police added.
The last bomb attack in that port was on March 16, killing 16 people and injuring another 16. Since January, 20 people have died and a further 39 have been hurt in Buenaventura.
In all the cases the authorities blame the Revolutionary Armed Forces of Colombia guerrilla group (FARC).
Last week, Governor of Del Valle province Angelino Garzon said the attacks were part of a turf war between the FARC and demobilized paramilitaries belonging to the United Self-Defence Forces of Colombia as well as smaller drug-trafficking groups.