New Delhi  - Army troops worked to rescue marooned villagers as floods and landslides caused by monsoon rains in India's north-eastern region killed 25 people and displaced 311,000 others over the weekend, officials said Monday.

According to the Flood Control department in the Assam state, six people drowned overnight in the Lakhimpur district, some 360 kilometres north-east of state capital Guwahati.

"We have reports that six people were washed away by the swirling waters of Ranganadi river in the district; 311,420 people have been displaced from their homes in Lakhimpur and its adjoining district of Sonitpur in the first wave of monsoon floods," senior Flood Control department official Anamika Tiwari said.

In Assam's neighbouring state of Arunachal Pradesh, 19 people were killed and 30 injured in mudslides near state capital Itanagar.

While 14 people were killed on Saturday, three others died in a hospital on Sunday and two bodies were removed from under a collapsed house on Monday.

The army and paramilitary Border Security Force were working to relocate people from 500 flood-hit villages in Lakhimpur and Sonitpur districts.

"Hundreds of villagers who were trapped in the homes have been moved to makeshift camps. We are providing food water and medicines and other relief to the people," SR Islam, another official in the Flood Control Department said.

"The government has sounded a flood alert in the districts following the breach in embankments of the Ranganadi hydropower project. The regional weather officials have warned about heavy rains over the next few days and the flood situation could turn critical," he added.

Assam, one of the Indian states which is generally worst-affected by the monsoon havoc, received heavy rains last year that claimed 87 lives and left 11.2 million people homeless.

Floods in Assam in 2004 killed at least 200 people displaced more than 12 million. (dpa)