Filming on Sandra Bullock's new movie The Heat in Boston, Massachusetts came to a standstill on Monday (09Jul12) after a city bus collided with a set vehicle during the morning rush hour.
Reports suggest a dozen passengers on the bus were briefly hospitalised for non-life threatening injuries.
One uninjured passenger tells website Boston.com, "People were screaming and they were everywhere on the bus."
Details of how the accident occurred remain unclear.
Bullock plays an FBI agent in the Paul Feig comedy, which also reteams the director with his Bridesmaids star Melissa MCCarthy.