A man in Ohio is thought to have been killed by his dogs after being found with hundreds of bite wounds all over his body.
A mastiff is believed to have been among the pet dogs
Michael Winters, 30, was found by his father in a pool of blood in the driveway of his home, around 35 miles southwest of Cleveland.
Coroner Paul Matus said up to nine dogs left "hundreds" of bites on Mr Winters that caused extensive bleeding.
The dogs appeared to have targeted areas of Mr Winters' body where there were arteries, including the neck and thigh, Mr Matus said.
The dogs were of various breeds and are thought to have included a mastiff and a rottweiler.
Officers said they shot two of the animals because they became aggressive when approached, and seven others were euthanised.
The coroner said the attack could have been caused by the dogs developing a pack mentality.
"We really don't know what prompted this," Mr Matus said.
"When they develop a pack mentality, they are likely to launch an attack on someone."
The dogs' remains will be tested for diseases, including rabies.
A mastiff is believed to have been among the pet dogs
Michael Winters, 30, was found by his father in a pool of blood in the driveway of his home, around 35 miles southwest of Cleveland.
Coroner Paul Matus said up to nine dogs left "hundreds" of bites on Mr Winters that caused extensive bleeding.
The dogs appeared to have targeted areas of Mr Winters' body where there were arteries, including the neck and thigh, Mr Matus said.
The dogs were of various breeds and are thought to have included a mastiff and a rottweiler.
Officers said they shot two of the animals because they became aggressive when approached, and seven others were euthanised.
The coroner said the attack could have been caused by the dogs developing a pack mentality.
"We really don't know what prompted this," Mr Matus said.
"When they develop a pack mentality, they are likely to launch an attack on someone."
The dogs' remains will be tested for diseases, including rabies.