Early morning landslides in India triggered by pounding monsoon rains have killed at least 10 people with hundreds more feared trapped under the earth, officials said on Tuesday.

The southern coastal state of Kerala has been battered by torrential downpours, and the collapse of a key bridge at the disaster site in Wayanad district has hampered rescue efforts, according to local media reports.

At least 10 have been confirmed dead so far, a district official in Wayanad told AFP on condition of anonymity as they were not authorised to speak to media.

India's army said it had deployed more than 200 soldiers to the area to assist state security forces and fire crews in search and rescue efforts.

"Hundreds of people are suspected to have been trapped," it said in a statement.

Prime Minister Narendra Modi said he had assured the Kerala government of "all possible help" with the situation.

"My thoughts are with all those who have lost their loved ones and prayers with those injured," he said in a post on social media platform X.

More rainfall and strong winds were forecast in Kerala on Tuesday, the state's disaster management agency said.

Indian opposition leader Rahul Gandhi, who until recently represented Wayanad in parliament, said he was "deeply anguished" by the disaster. "I hope those still trapped are brought to safety soon," he added.

Monsoon rains across South Asia from June to September offer respite from the summer heat and are crucial to replenishing water supplies.

But they also bring destruction every year in the form of landslides and floods. (AFP)