Manila  - Seven people were injured Saturday in a grenade explosion on a southern Philippine city, a provincial police chief said.

The explosion occurred before dawn in front of a construction supply store in Iloilo City, 490 kilometres south of Manila, according to Senior Superintendent Melvin Mongcal.

Mongcal said a man riding a motorcycle hurled the grenade in front of the steel gate of EGC Construction Supply in the village of Molo.

All the victims suffered shrapnel wounds and were being treated at a nearby hospital. Police were investigating the incident. (dpa)