Rescuers were answering thousands of calls from people trapped in Houston early Sunday, officials said, as torrential rain from deadly Hurricane Harvey caused "catastrophic flooding" in the city and across southeast Texas.

Rescuers were answering thousands of calls from people trapped in Houston early Sunday, officials said, as torrential rain from deadly Hurricane Harvey caused "catastrophic flooding" in the city and across southeast Texas.

More than 3,000 Bay City residents were without power after Hurricane Harvey made landfall, but those on Hillcrest Drive had each other for help.

More than 3,000 Bay City residents were without power after Hurricane Harvey made landfall, but those on Hillcrest Drive had each other for help.

Limited, poorly maintained infrastructure in a wet city without zoning makes Houston remarkably susceptible to devastating floods.

Limited, poorly maintained infrastructure in a wet city without zoning makes Houston remarkably susceptible to devastating floods.

Limited, poorly maintained infrastructure in a wet city without zoning makes Houston remarkably susceptible to devastating floods.

The police chief of Port Aransas said the emotional toll after the hurricane swept through is hard to describe. Every business in town was damaged.

The police chief of Port Aransas said the emotional toll after the hurricane swept through is hard to describe. Every business in town was damaged.

The police chief of Port Aransas said the emotional toll after the hurricane swept through is hard to describe. Every business in town was damaged.

An image of elderly women in a Texas nursing home surrounded by waist-deep flood waters went viral on social media on Sunday, prompting an emergency evacuation of the facility.

Limited, poorly maintained infrastructure in a wet city without zoning makes Houston remarkably susceptible to devastating floods.

Limited, poorly maintained infrastructure in a wet city without zoning makes Houston remarkably susceptible to devastating floods.

Lowering inflammation using a drug called canakinumab cut the risk of heart attacks and stroke and also lowered lung cancer risk, independent of cholesterol.

Lowering inflammation using a drug called canakinumab cut the risk of heart attacks and stroke and also lowered lung cancer risk, independent of cholesterol.

Lowering inflammation using a drug called canakinumab cut the risk of heart attacks and stroke and also lowered lung cancer risk, independent of cholesterol.

As rescuers scramble to save people from catastrophic flooding, you can do your part without even leaving your couch.

As rescuers scramble to save people from catastrophic flooding, you can do your part without even leaving your couch.

As rescuers scramble to save people from catastrophic flooding, you can do your part without even leaving your couch.

As rescuers scramble to save people from catastrophic flooding, you can do your part without even leaving your couch.