At least five people are dead and two children remain missing after they were swept away by fast-rising floodwaters in Pennsylvania on Saturday, officials said.

“It’s very possible” there could be more victims, Bucks County Coroner Meredith Buck told the Bucks County Courier Times, part of the USA TODAY Network.

Two of the dead were found together in one area and the third was found in a separate location. All three were found outside their vehicles, Buck said. Officials are trying to sort out which vehicles belong to which victims as many drivers abandoned their cars in the water, which in some places rose to 5 feet above the roadway.

Search and rescue efforts are now focused on the missing 9-month-old boy and his 2-year-old sister, whose mother is among the five confirmed dead, Bucks County officials said Sunday night.

“We are all grieving, however, our commitment to find the two children is unwavering as we do all we can to bring them home to their loved ones,” Bucks County Fire Chief Tim Brewer said during a news update. “Our hearts do go out to the families. We are not going to give up regardless.”

Brewer also said a second woman was found dead Sunday about 100 yards from where the first victim was found.

For two hours, rain fell like a waterfall, which turned a creek into a raging rapid that swept away nearly a dozen cars and more than a dozen people in what officials described as a “new benchmark” for flash flooding in Upper Makefield.

“The flash flooding caught numerous motorists by surprise and many were trapped,” the Upper Makefield Police wrote in an online update Sunday.

Heavy rain swamps parts of East Coast

Other parts of the East Coast were slammed with pounding rain, including hard-hit Vermont, which experienced days of flooding last week. On Sunday, Vermont officials were monitoring possible landslides.

“My team and I continue to monitor the situation as more rain falls in Vermont. There are flash flood warnings throughout the state today. Remain vigilant and be prepared,” Gov. Phil Scott said.