(Updated 1:24 a.m.) Residents near the Tullahan River have started evacuating to higher ground after the La Mesa Dam overflowed and spilled its waters to outlying areas, Quezon City Mayor Herbert Bautista said in a phone interview on GMA's "Saksi" late Monday.

At 1 a.m. the dam's water level was at 80.31 meters, beyond its spilling level.

Meanwhile, areas near the Marikina River were placed on Alert 3 as of 1:20 a.m. after the river level rose to 17.3 meters, the Marikina Public Information Office reported.

The highest level, 4, is raised when the water level goes beyond 18 meters and residents are forcibly evacuated to safety. — DVM/YA, GMA News