Three people were killed and 20 injured when a bomb planted on a motorcycle exploded Sunday in Pakistan’s restive southwestern province of Baluchistan, officials said.

Three people were killed and 20 injured when a bomb planted on a motorcycle exploded Sunday in Pakistan's restive southwestern province of Baluchistan, officials said.

The bomb went off in the town of Sibi 130 kilometers (81 miles) southeast of the provincial capital Quetta.

Senior police official Ghulam Ali Baluch, who gave the casualty toll, said two of the injured are in critical condition.

"The bomb was planted in a motorbike. We are investigating the possible targets but we have not found any specific target yet," Baluch said.

Senior administration official Akbar Hussain Durrani confirmed the incident.