The remnants of Hurricane Ida are slamming the northeastern US with record-breaking rain.
The Mayor of New York City has declared a state of emergency, calling it "a historic weather event." Reports say at least seven people died.
Ida has sparked flash floods and tornadoes around the region.
Rain from the storm swamped roads and homes. Social media images show water gushing over subway platforms in New York.
Local media reports say first responders scrambled to remove people stuck on trains as the tracks filled with water. Nearly all subway lines in New York are out of service.
Officials are urging people to stay indoors, and have ordered all non-emergency vehicles off the roads.
New Jersey has also declared a state of emergency. Local media say at least one person was killed in flash flooding in that state.