Several electronic voting machines malfunctioned, with some refusing to accept ballot papers, while others bogged down.
[4] As a result of the delays, COMELEC has extended voting hours from 6:00 p.m. to 7:00 p.m.[5] A series of explosions in Marawi, a sports utility vehicle parked in front of an elementary school exploded, followed by a series of explosions in Mindanao State University.
[6] Armed supporters of contending vice mayoralty candidates in Kabuntalan, Maguindanao figured in a clash near the polling center.
[7] In La Union, four were hurt when a homemade bomb exploded in a corridor of the Saint Nicholas Academy.
Those who were killed might be supporters of Congressional candidate Plaridel Abaya, for the van they were riding sported his yellow stickers.