NEW : President calls the attack a ` ` terrorist '' attack , offers 30 million peso award . NEW : ` ` We have to continue to be on the offensive , '' President Arroyo says . Explosive cylinders were triggered by explosives inside a vehicle , a government official says . On Saturday , the president condemned what he called a `` cowardly '' act and offered a reward of up to 30 million pesos ( $ 15,500 US ) for any information leading to those responsible . They killed 5 soldiers , a police officer and three civilians .
NEW : President calls the attack a ` ` terrorist '' attack , offers 30 million peso award . NEW : ` ` We have to continue to be on the offensive , '' President Arroyo says . Explosive cylinders were triggered by explosives inside a vehicle , a government official says . They killed 5 soldiers , a police officer and three civilians .