At Least 4 Dead and 4 Missing in West Virginia Flash Flooding

At least four people died and four people were missing in West Virginia after flash flooding destroyed homes and washed away roads, as more rain deluged parts of the state on Sunday, officials said.

Louis Vargo, the director of the Wheeling-Ohio County Homeland Security and Emergency Management Agency, said at a news conference on Sunday that rainstorms Saturday night quickly became dangerous in Ohio County, which is about 50 miles west of Pittsburgh.

In a 30-minute period on Saturday night, 2.5 to four inches of rain fell, Mr. Vargo said, citing National Weather Service estimates.

He said he had worked in emergency management in the county for 35 years. “I’ve never seen anything like this,” he said.

As of Sunday afternoon, thunderstorms were producing heavy rain and an additional two to 3.7 inches of rain had fallen, according to the Weather Service, which issued a flash flood emergency for Fairmont, W.Va.

“Additional rainfall amounts of 0.5 to 1 inch are possible in the warned area,” the service said. “Flash flooding is already occurring.”

Gov. Patrick Morrisey of West Virginia said on social media on Sunday that the flooding had contributed to a partial apartment building collapse in Marion County. There was no immediate information about whether anyone was injured.

The governor said at a separate news conference on Sunday afternoon that four people had been killed in the flooding that started on Saturday night. Officials did not provide details about those who died but said that one of the victims was a 3-year-old.

Four other people remained missing after Saturday night’s heavy rains. Jim Blazier, chief of the Wheeling Fire Department, said emergency workers were using drones, dogs and swift water rescue teams to look for those missing.

Officials said that an unidentified fire station and a rescue truck were lost to the flooding.

Power outages were reported as of Sunday afternoon, according to the Appalachian Power Company. Efforts to restore power were impeded by natural gas leaks, Mr. Vargo said. If power is turned on before a gas leak is fixed, it could cause an explosion.

Mr. Morrisey declared a state of emergency in Ohio County on Sunday.

“Please do not get on the road in the affected areas,” the governor urged residents. “Stay off the road.”

Johnny Diaz contributed reporting.