Authorities in an area hit by flash flooding west of Baltimore say they have no immediate reports of any fatalities. Emergency officials reported that at least one Ellicott City building has collapsed.
Maryland Gov. Larry Hogan earlier declared a state of emergency in the flood-stricken area.
Footage of Sunday's flash flooding in Ellicott City, Maryland, shows water surging around cars and pickup trucks.
A vehicle is being towed off of Ruxton Road in Towson, Md., May 27, 2018. But he said both were devastating.
During the July 2016 storm, 6 inches of rain fell in about an hour in Ellicott City. Another round of rain is expected Sunday evening, and conditions are rapidly changing, officials said.
WBAL's Bill Vanko lives in the area, and he saw the flooding up close and personal. "This was a true flash flood". But officials were just beginning to assess the damage.
Kittleman spoke at an outdoor news conference after Sunday's flooding in Ellicott City, Maryland.
Howard County Executive Allan H. Kittleman characterised the flooding as "very bad". He asks that those in the area stay off roads. "They say it's a once in a thousand year flood and we had two in two years".
Some people reported hearing a blaring alarm during the flooding.
Portalli's Italian Restaurant employee Arianna Wilgar said the water had reached the establishment's second floor.
"If you are trapped, we are coming", the Howard County Department of Fire and Rescue Services tweeted at one point. It added that multiple rescues were carried out, and rescue swimmers were called in.
There is also a flash flood warning for Grant and Mineral/Hardy and Hampshire Counties in West Virginia.
The nonprofit Ellicott City Partnership set up a website, HelpEllicottCity.com, to accept donations for businesses, residents and property owners. Some people had to evacuate to the roofs of buildings until first responders could come to their aid.
"Strong storms bringing heavy rain & potential for flash floods are now moving across central Maryland".