The Abu Sayyaf Islamic militant group carried out a bomb attack in Philippine President Rodrigo Duterte's home town that killed at least 14 people, the city's mayor said Saturday.

"The office of the president texted and confirmed that was an Abu Sayyaf retaliation. For the city government side, we are working on that it is an Abu Sayyaf retaliation," Sarah Duterte, who is also the president's daughter, told CNN Philippines.