Police say a landslide has hit three makeshift homes in a slum in Pakistan's port city of Karachi, killing 13 people.

Senior police officer Javed Jaskani says the incident took place early Tuesday when a mass of mud and rocks crashed down a hill into camps in Karachi, the capital of southern Sindh province. He says women and children were among the dead and injured.

State-run television says Prime Minister Nawaz Sharif has expressed grief over the incident and instructed authorities to aid the families of the victims.

Karachi is Pakistan's largest city and many poor laborers working there live in slums and makeshift homes near hills.