Video | Flock of birds suddenly drops dead on a Mexican street

More than a hundred migratory birds suddenly fell dead from the sky as they passed through Ciudad Cuauhtémoc, in Chihuahua, Mexico. The flock, made up of yellow-headed blackbirds, dropped from above on their way south from Canada, according to startling images captured by local police security cameras. Preliminary reports by veterinarians suggest two possible causes of the incident: the inhalation of a toxic gas or an electric shock.