NORTH MERRICK - Nassau County police are conducting an extensive search for a pit bull after they say it viciously attacked a woman.

According to authorities, the incident happened at around 11 a.m. near the Brookside School on Meadowbrook Road in Merrick.

Police say a 62-year-old woman had just finished walking on the school's track when she was approached by the dogs. They say the woman managed to call 911 from her cell phone.

Officers say the victim was still being attacked by the two pit bulls when they arrived. The officers fired at the dogs, striking and killing one, while the other took off behind the school.

The dog on the loose is described as tan with white on its stomach. The Nassau County Police Department is reminding residents in the area, for their own safety, to remain indoors during their extensive search.

The victim received bruises and lacerations to her head and face. In addition, she suffered from serious, deep lacerations to her left arm and both legs. She was transported to the Nassau University Medical Center in critical condition.