Watertown police is investigating after they say that a Black Nissan Altima that was left running was stolen from a gas station Sunday morning.

The incident happened around 10:15 a.m. outside the Shell Gas Station on Straits Turnpike.

Surveillance video shows another car pulling up alongside the Nissan.

A passenger gets out of the vehicle and into the Nissan and both cars take off.

Police say the car was left running while the driver went into the store.