Pakistan has seen higher-than-normal monsoon rains since June 26 that have killed at least 645 people across the country, with 400 deaths in the northwest. The National Disaster Management Authority issued an alert for further flooding after new rains began Sunday in many parts of the country.

Over 350 people have died in a 72 hour period in Pakistan due to monsoon flooding, Pakistan's National Disaster Management Authority reported, bringing the total number of people killed to over 650 since June 26.

At least 20 people have been killed when new monsoon rains caused flooding in northwestern Pakistan, local officials say, as the region is ravaged by an unusually intense and deadly monsoon season.