A female officer has suffered "multiple serious injuries" and four male officers were also hurt during an incident in Sheffield involving a man reportedly armed with an axe.
South Yorkshire Police said the officers were hurt as they responded to a "domestic incident" in the Gleadless area of the city on Wednesday evening.
A man in his 30s was arrested inside a Co-op store on suspicion of attempted murder.
A force spokesman said: "The Sheffield Pc suffered multiple serious injuries while responding to a domestic incident in Plowright Close at around 7.50pm last night where a man was reportedly armed with an axe.
"The Pc and a second male officer were injured as they made attempts to arrest the man.
"Then, three other officers, all men, were also injured as they arrested the man, in his 30s, inside the Co-op store, in Blackstock Road, on suspicion of attempted murder. He remains in custody."
People living in the area reported the arrival of large numbers of police vehicles as the area was cordoned off.
The spokesman said: "There was a significant police presence in the area overnight and cordons are still in place at the scene. We'd like to thank residents in the street and close by for their patience.
"Did you see what happened?"
The Co-op was shut on Thursday morning, with people shopping in the adjacent precinct saying they were shocked by what had happened.
Locals said they believed the incident began at a maisonette in a block about 200m from the store and the woman officer was injured in that flat.
The man is then reported to have crossed the road to the Co-op, where he started throwing stock around.
The block of flats remained cordoned off, with a police guard on one of the properties.