This photo provided by Jersey Central Power & Light shows flooding along Snyder Road, in Phillipsburg, N.J., near the intersection with county Route 519, Sunday, July 16, 2023. (Courtesy of JCP&L via AP)

WASHINGTON CROSSING, Pa. (AP) — Crews in suburban Philadelphia on Monday intensified the search for a missing 9-month-old boy and his 2-year-old sister, swept away after weekend rains swelled the banks of a creek while they were driving to a barbecue with their family. Upper Makefield Township Fire Chief Tim Brewer said Monday the effort would be a “massive undertaking” and that 100 search crew and numerous drones would be looking for the siblings along the creek that drains into the Delaware River in Bucks County, Pennsylvania. Brewer says the children are part of a Charleston, South Carolina, family visiting relatives and friends and were driving when they got caught in a flash flood Saturday.