The war-ravaged Islamic city of Marawi was not spared by tropical storm Vinta on Friday.
Several residents faced another challenge after their streets were inundated by stormwater due to heavy rains.
The Provincial Disaster Risk Reduction and Management Council of Lanao del Sur said the towns of Kapai, Buadiposo, and Bubong were also flooded.
Amer Lucman, head of Lanao del Sur's PDRRMO, said a government-built dam reportedly collapsed, which worsened the flood.
Affected residents were forcibly evacuated to the capitol gym.