The United States on Thursday issued an advisory, asking its citizens not to visit Kerala because of the flash floods in the state, news agency PTI reported.
In the advisory, the US said the heavy southwest monsoon rains triggered landslides and floods in the state, and American citizens should avoid visiting all affected areas in the state.
"Avoid all areas throughout Kerala affected by landslides and flash floods," it read.
At least 26 people have lost their lives till Friday morning due to incessant rainfall and flooding in the past two days, the Home Ministry said.
Chief Minister Pinarayi Vijayan described the situation as "very grim".
With water levels rising in various dams and reaching almost their maximum capacity, shutters of at least 22 reservoirs in Kerala have been opened to drain out excess water.
Heavy rains for the past two days and release of water from the Idamalayar dam yesterday, resulted into localised flooding in low-lying areas in the northern districts of Kerala.
The flood water also triggered landslides at some places.