Updated at 4:40 p.m. Sunday: Revised to include additional information from police and a neighbor.

A woman has died of her injuries after being attacked by her two pit bulls at an Irving veterinary clinic Saturday morning.

The attack took place about 11:45 a.m. at O'Connor Animal Hospital, where the two dogs had been quarantined after a biting incident earlier this month, police said.

Johana Villafane, 33, of Irving had visited the facility to feed the dogs when she was attacked in an outside exercise area.

When staff noticed they hadn't seen the woman in some time, they went to check on her. They found her bloody on the ground, being attacked by the two dogs, and called 911.

Responding officers arrived to find the dogs still attacking the woman and wouldn't let anyone get near her. An officer then shot and killed the animals.

Irving police spokesman James McLellan said Sunday that the dogs were quarantined so they could be observed for signs of rabies after they had gotten loose earlier this month in the neighborhood where they lived.

Grant Dickey, one of Villafane's neighbors, told KTVT-TV (Channel 11) that the dogs broke through his fence that day before they escaped into the neighborhood and bit someone.

Police initially thought the dogs were Dickey's, he told the station.

"They saw the pit bulls going in and out of the hole that they made in my back fence and asked me if they were my dogs," Dickey said. "I said, 'No, it's the neighbor's dogs ... they broke through into my yard earlier,' and they said, 'Well, they bit somebody when they got out.'"

He told KTVT-TV the dogs seemed friendly, but "aggressively friendly."

A Facebook fundraiser page for Villafane described the woman as "an amazing mom that was completely in love with her two children."

Staff writers Loyd Brumfield and Dana Branham contributed to this report.