Police are investigating the drug overdoses of four people at a Grafton residence, including a woman who police said was mauled by a dog.
Officers were called at 4:45 a.m. by someone inside the home in the 1700 block of Falls Road who reported the overdoses.
Officers began initiating life saving procedures and found a woman who had major facial trauma, which was later revealed to be from an attack by a dog inside the home, police said.
The woman is in critical condition, undergoing surgery from the dog attack, police said. Another person is in grave condition and two others are being treated and are expected to survive.
Jeff Caponera, Grafton Police chief, said in a news release that the investigation is ongoing and a search warrant is being sought to obtain additional evidence.
He said the group had been at a bar in the Saukville area where they bought drugs.
The three dogs in the home, including the one that attacked the woman, were placed in quarantine at the Ozaukee Humane Society.