BOSTON (CBS) – Panic and chaos are seen in video taken by the wife of WBZ-TV reporter Paul Burton.

Burton was running in the Boston Marathon Monday, his wife was in the grandstand seating area watching runners cross the finish line.

The two explosions, just seconds apart, went off at 2:50 p.m.

In the video, two blasts can be heard followed by chaos as spectators cleared the seating area.