Pakistan has restored 70% of electricity and reopened damaged roads in the north and northwest after flash floods killed more than 300 people.

At least 21 people have died in monsoon rain-related incidents in Pakistan, authorities said, pushing the nationwide death toll over the last week above 400 as floods and landslides continue to devastate large parts of the country.

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