The death toll in the flood-ravaged province of Pakistan's Khyber Pakhtunkhwa (KP) has surged to 365, as torrential rains and flash floods continue to batter the region, with new casualties and destruction reported across several districts.

Across Pakistan, monsoon rains that began in late June have been heavier than usual, killing at least 645 people. Four hundred of those deaths were in the northwest alone, where narrow valleys and river-carved gorges funnel rainwater into sudden torrents.

Flash floods triggered by cloudbursts in the mountainous northwest have brought destruction since Friday in the worst spell of this year's monsoon.