Washington Mayor Vincent Gray joined president Obama's call for action on gun control, mentioning that one of the Navy Yard victims, Arthur Daniels, had already lost his 14-year-old son to gun violence and citing the string of mass public shootings in recent years.
President Obama said: "We Americans are not an inherently more violent people than folks in other countries, we are not inherently more prone to mental health problems, the main difference that sets our nation apart, what's different in America is it's easy to get your hands on a gun."
More top news
Six people have begun living in a dome in Hawaii to simulate what life would be like on Mars.
The 12th series of X Factor kicks off on ITV this Saturday but which previous winners went on to make it big?
A mother and her four young children who are feared to be travelling to Syria are being sought by police.