Authorities in Pakistan resumed rescue and relief work on Monday in the country's northwest where flash floods have killed over 300 people after heavy rain forced them to suspend operations for several hours, a government official said, Reuters reported.

Heavy rains that started on Friday have claimed lives and spread destruction in several northern districts, with most people killed in flash floods, according to the National Disaster Management Authority.

In hilly areas, the rains caused flash floods as well as mud and rock slides that washed away houses, buildings, vehicles and belongings.

Buner district was the worst hit, with over 200 deaths, according to Reuters.