The death toll from the worst flooding to hit India's Kerala state in a century has jumped to 357, authorities have said.
The idyllic tourist hotspot has been battered by torrential monsoon rains since the end of May, triggering landslides and flash floods that have swept away entire villages.
"Since May 29, when the monsoon starts in Kerala, a total of 357 people have lost their lives until now," a statement from the state's information officer said, with 33 losing their lives over the last 24 hours.
Some 353,000 people have taken shelter in 3,026 relief camps as thousands of army, navy and air force troops fan out to help those still stranded.
Roads and over 134 bridges have suffered damage, isolating remote areas in the hilly districts of the state which are worst affected.
Panic-stricken people have been making appeals on social media for help, saying they cannot get through to rescue services.
India has deployed thousands of soldiers and dozens of helicopters to rescue people marooned.
The weather office warned of more heavy "red" category rains as tens of thousands of people were stuck on the rooftops of houses and community centres.
Rescue workers have yet to reach many flooded areas, some too narrow for boats to navigate.
India has deployed thousands of soldiers and dozens of helicopters to rescue those marooned.
People trapped without food, water and electricity worried about being left without help as their phone batteries were dying.
An adviser to the state's chief minister put the initial loss estimate at $4 billion.
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Prime Minister Narendra Modi, who was taken by helicopter over inundated farmland and villages, promised more helicopters, boats and other equipment needed to expand the rescue operation in the still unfolding emergency.
He said the army, air force, navy and coast guard were assisting disaster relief agencies in the rescue, and a total of 38 helicopters had been pressed into service along with a number of aircraft and ships to ferry resources.
"More helicopters, boats and other equipment are being sought and Modi promised to provide all of these as fast as possible", Kerala Chief Minister Pinarayi Vijayan said.
"The air marshal in charge of the air operations said more helicopters are on the way."
With hundreds of thousands of people converging in halls and auditoriums of schools, temples, churches, and mosques with little or no toilet facilities, people from less affected areas moved in to help those badly in need.
But some people in the relief camps were finding it difficult to access food and water.
Mr Vijayan has estimated that more than two million people have been forced to move into relief camps since the monsoon season began.
