'Flash mob' results in evacuation
A shopping centre in Northern California had to be evacuated after nearly 5,000 holiday revellers showed up for a "flash mob" organised by a local choral society.
Fire Inspector Tom Dodaro said the spontaneous holiday musical performance at the Roseville Galleria drew a huge crowd.
Officials said there were reports of the floor and foundation moving and creaking near the food court, which spurred the evacuation.
Flash mobs are groups of singers or dancers whose surprise performances in public places are often recorded and posted online.
The group was there on Monday to sing Handel's Hallelujah Chorus in an event organised by the Sacramento Choral Society and Orchestra.
The evacuation was orderly, and the singers moved their performance outside the shopping centre.