A suspect shot and seriously wounded a Milwaukee police officer sitting in his squad car before fleeing and apparently killing himself shortly afterwards.

A man has been charged with second-degree murder after he called a US TV news station and discussed details of a cold case involving a 13-year-old girl whose body was found more than 30 years ago.

Reports of a lion roaming a US city have put police and others on the lookout.

The driver of a car which struck and killed a toddler in Milwaukee has been shot dead at the scene of the accident. A 15-year-old boy was also shot and died later.