Unidentified gunmen opened fire at a van along EDSA highway in Metro Manila's Mandaluyong City.
Local police said a woman, who sustained serious injuries from the shootout, is under medical care.
Checkpoint security checks in Metro Manila have intensified as the election gun ban is currently in place.
Officials said they are yet to determine the identity of the suspects and their motive for the attack.

Hurricane Melissa hits Cuba hours after devastating Jamaica
Trump says Gaza ceasefire holds, Israel has right to hit back if attacked
South Korea welcomes Trump with its highest award, a golden crown and ketchup
Ex-Philippines president Duterte appeals ICC jurisdiction ruling
Cyclone Montha lashes India's east coast; kills one
