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DAVAO CITY, PHILIPPINES - SEPTEMBER 04: Filipinos offer flowers, candles, and prayers at the site of a recent deadly bomb blast in Davao City, Philippines, on September 4, 2016. The Philippine government blamed the Abu Sayyaf militant group for a blast that killed 14 people in the southern city of Davao, prompting Philippine President Rodrigo Duterte to declare a 'state of lawlessness' following the explosion. According to reports, Philippine police are searching for four people involved in Friday's bombing although they are not ruling out there could be more people involved in the attack, such as the drug syndicates, which has been targeted across Philippines in a bloody crackdown. (Photo by Jes Aznar/Getty Images)

DAVAO CITY, PHILIPPINES - SEPTEMBER 04:  Filipinos offer flowers, candles, and prayers at the site of a recent deadly bomb blast in Davao City, Philippines, on September 4, 2016. The Philippine government blamed the Abu Sayyaf militant group for a blast that killed 14 people in the southern city of Davao, prompting Philippine President Rodrigo Duterte to declare a 'state of lawlessness' following the explosion. According to reports, Philippine police are searching for four people involved in Friday's bombing although they are not ruling out there could be more people involved in the attack, such as the drug syndicates, which has been targeted across Philippines in a bloody crackdown.  (Photo by Jes Aznar/Getty Images)