HINDMAN, Ky. >> Damage to critical infrastructure and the arrival of more heavy rains hampered efforts Sunday to help Kentucky residents hit by recent massive flooding, Gov. Andy Beshear said.

As residents in Appalachia tried to slowly piece their lives back together, flash flood warnings were issued for at least eight eastern Kentucky counties. The National Weather Service said radar indicated up to 4 inches of rain fell Sunday in some areas, with more rain possible.

Beshear said the death toll climbed to 28 on Sunday from last week’s storms, a number he expected to rise significantly and that it could take weeks to find all the victims.

As many as 37 people were unaccounted for, according to a daily briefing from the Federal Emergency Management Agency. A dozen shelters were open for flood victims in Kentucky with 388 occupants on Sunday.

Gen. Daniel Hokanson, chief of the U.S. National Guard Bureau, told The Associated Press about 400 people have been rescued by National Guard helicopter. He estimated that the guard had rescued close to 20 by boat from hard-to-access areas.

At a news conference in Knott County, Beshear praised the fast arrival of FEMA trailers but noted the numerous challenges.

“We have dozens of bridges that are out — making it hard to get to people, making it hard to supply people with water,” he said. “We have entire water systems down that we are working hard to get up.”

Beshear said it will remain difficult, even a week from now, to “have a solid number on those accounted for. It’s communications issues — it’s also not necessarily, in some of these areas, having a firm number of how many people were living there in the first place.”

The governor also talked about the selflessness he’s seen among Kentucky residents suffering from the floods.

“Many people that have lost everything but they’re not even getting goods for themselves, they’re getting them for other people in their neighborhoods, making sure that their neighbors are OK,” Beshear said.

Parts of eastern Kentucky received between 8 and 101/2 inches over 48 hours. About 13,000 utility customers in Kentucky remained without power Sunday, poweroutage.us reported.

President Joe Biden declared a federal disaster to direct relief money to more than a dozen Kentucky counties.

Last week’s flooding extended to West Virginia, where Gov. Jim Justice declared a state of emergency for six southern counties, and to Virginia, where Gov. Glenn Youngkin also made an emergency declaration that enabled officials to mobilize resources across the flooded southwest portion of the state.