Watch: Flash flooding sweeps through New York City subways

Subway passengers in New York City were left stranded inside carriages after torrential rain caused flood waters to gush onto platforms.

Video footage from the platform of 28th Street Station showed passengers watching from inside the train as water poured into the station.

Other videos showed passengers kneeling on their seats to avoid the water seeping into the train.

In New Jersey, Governor Phil Murphy declared a state of emergency as flash floods submerged cars and closed roads.