The Latest: Ferdinand Marcos Jr., running for VP, votes

Wearing a neck brace and guarded by police, Arroyo waved at other voters as she walked into a voting center in Pampanga's Lubao town, accompanied by her husband.

The 69-year-old Arroyo, who is suffering from a neck ailment, finished her tumultuous nine-year term in 2010.

[...] she has been separately charged with vote fraud and in another corruption case and was eventually detained.

Aquino was elected with a landslide margin on a promise to rid the Philippines of corruption and vowed to prosecute Arroyo and her inner circle, blaming them for stealing money for personal gain and for a culture of impunity in which corrupt practices flourished.

Police say the victims, mostly Muslim street vendors, were forced to alight from their van on a main road by the gunmen, who then opened fire with assault rifles.

[...] violence, including allegations of cheating, and attacks on voting centers and political headquarters of candidates, have marred elections in the past, especially among rival local politicians in the provinces.