Xerxes Trinidad, the Armed Forces of the Philippines' public affairs chief, called the male suspect "one of the accomplices." He did not elaborate on the details of the suspect's arrest.
Authorities earlier identified two people of interest who allegedly planted the improvised explosive under a seat inside the gym of Mindanao State University in Marawi City on Mindanao island.
The blast targeted hundreds of students and teachers who attended a Catholic service.
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