This NOAA satellite image shows severe weather in the US Central and Southern plains was taken by GOES East at 1445 UTC on April 19, 2016. Flooding in and around the US city of Houston has killed at least five people and prompted mass rescues, reports said. With rain wreaking havoc in the Texas city -- the fourth most populous in the country -- Governor Greg Abbott declared a state of disaster in nine counties. / AFP PHOTO / NOAA / Handout / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / NOAA" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS HANDOUT/AFP/Getty Images

In this April 18, 2016 photo children play in flood waters in the Kelliwood Park neighborhood of Katy, Texas. Flooding in and around the US city of Houston has killed at least five people and prompted mass rescues, reports said. With rain wreaking havoc in the Texas city -- the fourth most populous in the country -- Governor Greg Abbott declared a state of disaster in nine counties. A flash flood watch for Houston will remain in effect until Wednesday morning, as more rain is expected Tuesday, the city's Office of Emergency Management warned. Rain came down at rates as high as four inches an hour on Monday, the Weather Channel reported, saying some residents were trapped in their homes and cars. / AFP PHOTO / STRSTR/AFP/Getty Images

In this April 18, 2016 a view of flooded streets in the Kelliwood Park neighborhood of Katy, Texas. Flooding in and around the US city of Houston has killed at least five people and prompted mass rescues, reports said. With rain wreaking havoc in the Texas city -- the fourth most populous in the country -- Governor Greg Abbott declared a state of disaster in nine counties. A flash flood watch for Houston will remain in effect until Wednesday morning, as more rain is expected Tuesday, the city's Office of Emergency Management warned. Rain came down at rates as high as four inches an hour on Monday, the Weather Channel reported, saying some residents were trapped in their homes and cars. / AFP PHOTO / STRSTR/AFP/Getty Images

In this April 18, 2016 photo children play in flood waters in the Kelliwood Park neighborhood of Katy, Texas. Flooding in and around the US city of Houston has killed at least five people and prompted mass rescues, reports said. With rain wreaking havoc in the Texas city -- the fourth most populous in the country -- Governor Greg Abbott declared a state of disaster in nine counties. A flash flood watch for Houston will remain in effect until Wednesday morning, as more rain is expected Tuesday, the city's Office of Emergency Management warned. Rain came down at rates as high as four inches an hour on Monday, the Weather Channel reported, saying some residents were trapped in their homes and cars. / AFP PHOTO / STRSTR/AFP/Getty Images

In this April 18, 2016 a view of flooded streets in the Kelliwood Park neighborhood of Katy, Texas. Flooding in and around the US city of Houston has killed at least five people and prompted mass rescues, reports said. With rain wreaking havoc in the Texas city -- the fourth most populous in the country -- Governor Greg Abbott declared a state of disaster in nine counties. A flash flood watch for Houston will remain in effect until Wednesday morning, as more rain is expected Tuesday, the city's Office of Emergency Management warned. Rain came down at rates as high as four inches an hour on Monday, the Weather Channel reported, saying some residents were trapped in their homes and cars. / AFP PHOTO / STRSTR/AFP/Getty Images

In this April 18, 2016 a view of flooded streets in the Kelliwood Park neighborhood of Katy, Texas. Flooding in and around the US city of Houston has killed at least five people and prompted mass rescues, reports said. With rain wreaking havoc in the Texas city -- the fourth most populous in the country -- Governor Greg Abbott declared a state of disaster in nine counties. A flash flood watch for Houston will remain in effect until Wednesday morning, as more rain is expected Tuesday, the city's Office of Emergency Management warned. Rain came down at rates as high as four inches an hour on Monday, the Weather Channel reported, saying some residents were trapped in their homes and cars. / AFP PHOTO / STRSTR/AFP/Getty Images

In this April 18, 2016 photo children play in flood waters in the Kelliwood Park neighborhood of Katy, Texas. Flooding in and around the US city of Houston has killed at least five people and prompted mass rescues, reports said. With rain wreaking havoc in the Texas city -- the fourth most populous in the country -- Governor Greg Abbott declared a state of disaster in nine counties. A flash flood watch for Houston will remain in effect until Wednesday morning, as more rain is expected Tuesday, the city's Office of Emergency Management warned. Rain came down at rates as high as four inches an hour on Monday, the Weather Channel reported, saying some residents were trapped in their homes and cars. / AFP PHOTO / STRSTR/AFP/Getty Images

(FILES) This file photo taken on January 26, 2016 shows Malaysia's Prime Minister Najib Razak (C) walking towards his car after attending a parliament session in Kuala Lumpur. Malaysia's prime minister and the company he founded, 1MDB, have weathered a year-long barrage of corruption allegations with nothing-to-see-here assurances, but a string of recent revelations is placing those denials under growing strain. / AFP PHOTO / MOHD RASFANMOHD RASFAN/AFP/Getty Images