Officials in Beijing have launched all-out disaster relief and rescue operations in the last four days after a fresh spell of intense rainstorms damaged roads, disrupted power supply, and prompted mass evacuations.

Authorities in Beijing's northern suburbs and adjacent provinces were scrambling to reach victims of deadly flooding caused by extreme rainy season downpours.

The dayslong rainstorms have killed 30 people in the Chinese capital and eight in its neighboring province of Hebei, state-run broadcaster CCTV said.