At least 30 people have been killed and 18 others are missing in floods and landslides caused by heavy rains that lashed Nepal, police said Saturday.

The fatalities, which occurred on Friday and Saturday, include three members of a family in Kathmandu who died after a wall of their house collapsed on them, police said in a statement.

Twelve injured people are being treated at various health facilities, according to the statement. A total of 1,175 people have lost their homes, according to the Home Ministry's National Emergency Operation Center.

[NurPhoto/Getty/Kyodo]

Since Thursday, monsoon rains have battered 21 districts in eastern and central Nepal, submerging settlements, bringing down walls of homes, and causing landslides that have blocked highways at 11 points, the center said.

Many localities in the nation's capital are waterlogged, with security personnel using rubber boats to rescue 108 people trapped in their houses.

Archana Shrestha, spokeswoman of the Department of Hydrology and Meteorology, said the heavy rains are expected to continue until Sunday.

The Home Ministry has issued warnings for people residing near several rivers including the Koshi River, which flows from Nepal to India's Bihar and is regulated by the Koshi Dam.

"Koshi rose above safe level at 6 a.m. Saturday and the water level continues to rise," the ministry said in a text message issued to the public.

In the message, the ministry urged those residing in settlements in Sunsari and Saptari districts in eastern Nepal close to the embankments of Koshi River to stay on a high alert.

A total of 27,830 police personnel have been mobilized for rescue and relief work in affected areas, and also for clearing landslide debris from blocked highways.