ZAMBOANGA CITY: A powerful improvised explosive went off Saturday outside the house of a village chief in Lambayong town in Sultan Kudarat. Police said the blast damaged a truck parked outside the house of Ferdinand Agduma, whose father Florante is current Lambayong mayor. No individual or group claimed responsibility for the noontime bombing. Police are investigating whether the bombing was connected to politics. The bomb used in the attack was assembled from a 60mm mortar.