MARANTAO, Lanao del Sur — What was hailed as a historic milestone for the Bangsamoro peace process faced serious integrity questions here on Monday after voters in Lanao del Sur discovered that unknown individuals had cast their ballots. Mindanao State University (MSU) History Professor Tirmizy Abdullah called the parliamentary election a “milestone in the Bangsamoro peace process” after casting his vote at Bacong Elementary School just before 9…