NEW DELHI (AP) — Rescuers used helicopters and boats on Friday to evacuate thousands of people stranded on their rooftops following unprecedented flooding in the southern Indian state of Kerala that killed more than 320 people, officials said.

"Kerala state is facing its worst flood in 100 years," the top state elected official, Pinarayi Vijayan's office tweeted.

With heavy rains stopping after a week, rescuers moved quickly to take those marooned by floods to 1,500 state-run camps. They used more than a dozen helicopters and about 400 boats across the state, relief officials said.

Vijayan tol...