SAO PAULO - The death toll from heavy rains in Brazil's southernmost state of Rio Grande do Sul rose to 29, local authorities said on Thursday evening, as the state government declared a state of public calamity to handle the dramatic situation.

The storms, which have caused the greatest devastation in the state in recent years, also left 60 people missing and 10,242 displaced in 154 cities, according to Rio Grande do Sul's civil defense.

"It's not just another critical case; it's the most critical that the state will probably have recorded in its history," state Governor Eduardo Leite said in a live broadcast on social media, adding that the situation is worse than last year's rains in the state.

President Luiz Inacio Lula da Silva told Rio Grande do Sul state Governor Eduardo Leite in a call late on Wednesday he would send as many men as necessary to help deal with the situation

More than 300,000 people have also been left without electricity after a dam at a small hydroelectric power plant burst on Thursday, the state's main utilities company said.

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President Luiz Inacio Lula da Silva flew over the affected areas and met with Governor Leite in Santa Maria on Thursday for an emergency meeting.

"I told the governor and my ministers that the federal government will make every effort. ... We will take care of this with great care and respect," Lula said during the meeting.

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In a video posted on social media, Leite called for coordination in the efforts to rescue people, asking for "full force" as he declared a state of public calamity citing the risk faced by the state as a result of climate events.

Lula told Leite in a call late on Wednesday he would send as many men as necessary to help deal with the situation, the president's office said.

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Brazil has faced a recent spate of natural disasters. More than 50 people were killed in Sao Paulo state last year after massive downpours caused landslides and flooding.