NEW YORK (CBS News).- At least six people died and more than 500,000 households lost electricity after weekend torrential storms tore through northeastern United States.

Strong winds and heavy rains uprooted trees, downed power lines and flooded creeks in Connecticut, New Jersey, New York and Pennsylvania at the peak of Saturday's storm.

One woman died when a falling tree struck her as she was walking late Saturday in Greenwich, Conn., police said. Another woman was killed in Westport, Conn., when a tree fell on a car Saturday evening.

In Teaneck, N.J., two neighbours were killed by a falling oak tree as they headed home from a synagogue at 7 p.m. on Saturday.

In Hartsdale, N.Y., a man died when a tree crushed the roof of his car, entangling it in live wire.

In Rhode Island, an off-duty officer died Sunday after his car hydroplaned in a patch of standing water left from the weekend storm.

In New Hampshire, a large pine tree fell on a car travelling on a highway on Sunday afternoon, killing a man and injuring his wife and child, police said.

At the storm's peak, more than 265,000 customers in the New York City area and 235,000 customers in New Jersey were without power. The Philadelphia area reported 70,000 customers without electricity, while more than 80,000 customers in Connecticut sat in the dark.

PECO, an electric company serving the Philadelphia area, had assistance from crews from western Pennsylvania and Michigan, but some customers may have to wait until Monday for power to be restored, spokesman Fred Maher said.