As a capacity Radio City Music Hall audience of 6,200 watched Bing Crosby's "White Christmas" on November 7, a bomb stuffed into the bottom cushion of a seat in the 15th row exploded, injuring four patrons. The explosion was muffled by the heavy upholstery, and only those nearby heard it. While the film continued, the injured were escorted to the facility's first-aid room and about 50 people in the immediate area were moved to the back of the theater. After the film and the following stage show concluded an hour-and-a-half later, the police roped off 150 seats in the area of the explosion and began the search for evidence.