Two children were killed and at least 10 people injured, including other children, on Monday in a multi-vehicle crash involving a stolen police car in Dayton, Ohio, police said.
Thirty people died and dozens were wounded in two mass shootings within just 13 hours of each other in the United States, shocking the country and prompting calls from some politicians for tighter gun control.
The US man wanted for killing an elderly man in Ohio and posting a video of the murder on Facebook fatally shot himself on Tuesday after a brief pursuit in neighbouring Pennsylvania, police said.
One person was killed and at least 14 people were wounded in a shooting at a nightclub in Cincinnati, Ohio, early on Sunday, police said.
US President-elect Donald Trump said on Thursday he has picked tough-talking retired general James Mattis to be his defence secretary as he soaked up adulation at a large Ohio rally where he pledged to unite the nation.
Workers at the Cincinnati Zoo in the US state of Ohio shot and killed a gorilla after a three-year-old boy fell into its enclosure, officials said.
An experimental, solar-powered aircraft took off from Tulsa in Oklahoma early Saturday, kicking off the latest phase of its record-breaking quest to circle the globe without consuming a drop of fuel.