Heavy rain has swept across parts of the Northeast, inundating sections of New York and New Jersey with flash flooding that stranded vehicles in roadways, closed subway lines and led to the declaration of a state of emergency. Downpours moved through the region Monday night. The worst of the rain has moved on as of Tuesday morning, but some roads and streets are still flooded and one house in a flooded North Plainfield, New Jersey, neighborhood caught on fire and collapsed, possibly due to an explosion. New Jersey's governor declared a state of emergency Monday night due to flash flooding and heavy rainfall. In New York City, some subway service was suspended due to flooding.