Authorities are still investigating the cause of the collapse of the metal frame used in the skyway project in Muntinlupa City.
According to Muntinlupa City PIO Chief Tess Navarro, the mega metal frame suddenly collapsed along the East Service Road and hit six vehicles including motorcycles and cars.
He said the four people who were injured when the frame collapsed were rushed to the hospital.
Authorities and rescuers are still investigating whether anyone was involved in the incident.
Although the incident is now causing heavy traffic flow, the authorities are immediately working to avoid the scene of the accident.
Muntinlupa City Traffic Management Bureau chief Danidon Nolasco said excessive traffic is being experienced on the East Service Road from Muntinlupa City to Sucat in Paranaque.
Currently, both the north and soutbound lanes of East Service Road are closed but motorists can pass through West Service Road, Alabang-Zapote Road and Manuel L. Quezon, SLEX as an alternative road.