Houston struggles with massive flooding as more rain forecast Photograph: (AFP)
Widespread flooding unleashed by deadly storm Harvey left Houston -- the fourth-largest US city -- increasingly isolated Monday, with airports and highways closed and residents being rescued from their inundated homes by boat and helicopter.
The city's two main airports suspended all commercial flights and two hospitals were forced to evacuate patients. A local television station also was knocked off the air.
At least three people have been killed so far, with reports of other fatalities still unconfirmed.
The National Hurricane Center called the flooding "unprecedented" and said the storm, which crashed ashore late Friday as a huge Category 4 hurricane, would move into the Gulf before doubling back midweek, bringing even more rain.
The storm early Monday remained almost stationary, inching towards the southeast at just three miles (six kilometers) per hour, the NHC said in its 0900 GMT bulletin.
President Donald Trump, who had said he did not want to disrupt emergency efforts with a visit, plans to go to the disaster zone on Tuesday.
Roads completely submerged
Rising waters from Harvey inundated roads throughout the Houston area, affecting every major freeway and hamstringing efforts to move people to safety.
"It's crazy to see the roads you're driving on every day just completely under water," Houston resident John Travis told AFP.