An arson squad was en route to investigate.
All of the attacks occurred in or near Palmer Park along Woodward.
Offended Twitter users mocked the Associated Press with the hashtag “#APHeadlines.”
Theodore Wafer was found guilty Thursday of second-degree murder and manslaughter in the fatal shooting of 19-year-old Renisha McBride.
In May, Detroit Police Chief James Craig inexplicably stopped releasing public information on daily shootings, murders and other violent crimes, making it appear as if the city was safer than it is.
Theodore Wafer said he was defending himself when he opened his front door and shot a 19-year-old in the face.
The victim was the sixth murder victim discovered by firefighters in two months.
FBI agents and state police raided a rural St. Clair County home Wednesday as part of an investigation into the murder of a 14-year-old Armada girl.
The FBI also joined the search and was knocking on doors looking for information.
An adult soccer game in suburban Detroit turned deadly after one of the players fatally attacked the referee.