Thousand of Texans have being rescued from the Tropical Harvey storm Even as darkness fell and the waters kept rising, emergency officials in Houston continued fielding calls overnight from flood-stranded Texans.

Thousands have been rescued so far, many are still waiting to picked up.

"The Coast Guard is continuing to receive upwards of 1,000 calls per hour," US Coast Guard Lt. Mike Hart said Monday. "Today alone, the Coast Guard has rescued over 3,000 people. That includes both air rescues and rescues using boats."

Since midnight Sunday, more than 2,300 calls have poured in to the Houston Fire Department, including 400 calls for rescue Monday afternoon, Houston officials said. Four people have died as a result of the catastrophic storm.

Houston police had rescued 1,000 people since Monday morning, bringing the total number rescued to more than 3,000 since the storm flooded the city, Houston Mayor Sylvester Turner told reporters Monday night.