Two persons were pulled out alive from the debris by the locals and police in a nearby town, they said.
More than 50 tourists, including 24 from overseas, are stranded in a resort in Munnar after the road leading to it was damaged in a landslide.
Due to heavy rains and resultant floods in Kozhikode and Waynad districts, a National Disaster Response Force (NDRF) team has been moved to Kozhikode.
For the next three days, the Met department has predicted heavy rains in the worst-affected districts of Idukki and Wayanad. Buildings and infrastructure have collapsed, leaving over 54,000 people homeless.
In view of the devastation, the U.S. embassy Thursday advised its citizens to avoid the areas affected and constantly monitor local media for weather updates. Kerala received 15 per cent more rainfall than normal from June 1 to August 8.
Wayanad district has been completely cut off by landslides and the state government has sought the army's help to restore the road network to the hill district. Nearly all 40-odd rivers in the state are in spate, officials said.
Several Kerala districts have been receiving heavy rain since Tuesday, claiming at least 27 lives and causing widespread damage.
Flash floods kill 27 in south India
Meanwhile, the United States had issued a travel alert and advised the U.S. citizens to avoid visiting areas affected by landslides and flash floods.
With the possibility of release of more water from the Idukki reservoir, the state government has issued a fourth red alert. Three columns from the Military Engineer Services, two from Bengaluru and one from Hyderabad are also assisting in the rescue operations at Kozhikode and the Wayanad.
The Indian Navy has put on alert its Southern Naval Command in view of the rising water level in the Periyar river and a possible inundation of parts of Wellingdon Island surrounded by the backwaters of Kochi.
The flooding became more intense after all five gates of the Idukki dam were opened and shutters of more than two dozen dams were lifted, making the Periyar river swell further.
Arrivals at Cochin International Airport halted after water released from Idukki dam, the report added. People living in low-lying areas have been asked to remain vigilant. He will visit the flood-hit areas on Saturday. Singh also spoke with Vijayan and will make an aerial survey of the flood-affected areas on Sunday.