It is unknown who is behind the attack, which appears to have been timed to kill as many people as possible, but Muslim rebels and extortion gangs operate in the area.
UK DAILY MAIL At least nine people were killed and six others wounded today when a bomb ripped apart a passenger bus in the Philippines.
The vehicle, carrying 50 passengers, exploded shortly before arriving at its final destination in Matalam, in the southern Mindanao region.
The incident, which took place at 10.30am local time, revived fears about the safety of travel by bus among residents as they recalled similar attacks in 2006 and 2007. In those attacks, dozens of people were killed or injured.
The Abu Sofia gang and the Al-Khobar, Islamist insurgent groups, were blamed for the deaths. H/T Maria
Back in August, Muslim gunmen dressed as police opened fire on a bus and killed four.