Police say a Dallas-area woman was mauled to death by her two pit bull terriers as she tried to feed them at a veterinary clinic where the dogs were in quarantine for a prior attack.

Irving police say 33-year-old Johana Villafane of Irving was pronounced dead Saturday at a Dallas hospital.

A police statement says Villafane was at the clinic Saturday morning to feed the dogs and was in an exercise area when they attacked her.

The aggressive dogs prevented medical personnel from quickly reaching Villafane. A police officer shot and killed both animals and the woman was taken to a hospital where she died.

The statement didn’t describe the initial biting incident that led to the pit bulls being quarantined.