The acting secretary of the Department of Homeland Security (DHS) said on Monday that her agency is working to help those in need in the aftermath of Hurricane Harvey and had a warning for residents along the Texas Gulf Coast.

"While the hurricane force winds have diminished, I want to stress that we are not out of the woods yet," Elaine Duke said at a news conference.

"Harvey is still a dangerous and historic storm."

Duke said residents need help and the agency is "working to provide it."

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Life-threatening flooding will "occur over a large portion of south, south central and southeast Texas in the coming days," Duke said.

It is "vitally important" for those in Texas and Louisiana to monitor their local radio and TV stations for updated emergency information, she added.

"The department through [the Federal Emergency Management Agency] has been working in close coordination with the state and local officials throughout the region for many days in preparing for Hurricane Harvey," she said.

"Under the president's direction, we have made every resource available to respond to this historic storm."

Harvey made landfall Friday night as a Category 4 hurricane and has since been downgraded to a tropical storm.

The storm continues to bring rain and flooding to Texas.

President Trump is expected to visit Texas on Tuesday amid ongoing recovery efforts.