The last two surviving leaders of a deadly siege in the southern Philippines, including a top Asian terror suspect, were killed Monday in a push by thousands of troops to retake the last pocket of Marawi city still held by pro-ISIS militants, top security officials said.

Four military and police officials told The Associated Press that Isnilon Hapilon, who is listed among the FBI’s most-wanted terror suspects, and Omarkhayam Maute were killed in a gunbattle and their bodies were found Monday in Marawi.

The officials spoke on condition of anonymity because they were not allowed to make a public announcement of the latest developments in Marawi, a mosque-studded center of Islamic faith in the south of the predominantly Roman Catholic nation. Defense Secretary Lorenzana later confirmed the militant deaths.

“Yes, they are confirmed dead,” Lorenzana said, adding DNA tests would be done on the remains of the two militant leaders to pave the way for the payment of huge U.S. and Philippine bounties offered for the two.