At least 13 people have died while several are missing after sudden, heavy rainfall triggered flash floods in Texas Hill Country early Friday.Among the missing are 23 girls who were attending Camp Mystic, a summer camp with about 750 attendees. Rescue teams are continuing search efforts using helicopters, boats, and drones.Central Kerr County received over 10 inches (25 cm) of rain overnight. The Guadalupe River rose sharply, climbing 22 feet in just two hours. A river gauge in Hunt stopped working after recording nearly 30 feet, reported AP.The fast-moving waters flooded homes, swept away vehicles, and forced many people to seek safety on rooftops and even on trees.At least 400 emergency workers are involved in the response, with nine rescue teams, 14 helicopters, and 12 drones in use. Authorities have not yet confirmed the identities of the victims, who include both adults and children.The situation remains active, and officials warned that the death toll may rise. The forecast had issued a flood watch, later upgraded to a warning, affecting around 30,000 residents.The flooding in Texas happened while severe storms swept through central New Jersey, where thunderstorms were linked to at least three deaths. As a result, New Jersey called off its July Fourth parade, concert, and fireworks display.