(Bloomberg) — Typhoon Koppu left at least four people dead in the Philippines, shutting schools and government offices, while floods and landslides continue to threaten the nation's main Luzon island.

The slow-moving and powerful storm caused a wall to collapse in Zambales in central Luzon, killing a 62-year-old woman, while a toppled tree led to the death of a 14-year-old in Quezon City near the capital. A six-year-old girl is missing after she slipped from a hanging bridge and fell into a creek in Nueva Vizcaya province. Two bodies were found in floodwaters in Nueva Ecija province, ABS-CBN News reported.

More than 20,400 people were affected by Koppu, which hit land as a super typhoon on Oct. 18, the disaster risk-monitoring agency said. Thousands remain in evacuation centers while electricity is being restored in many households. The government suspended work Monday in regions of central and northern Luzon as schools in the capital and affected provinces were shut.