a very warm welcome to bbc news — broadcasting to our viewers in north america and around the globe. my name's mike embley. our top stories: the duke of edinburgh, the queen's 97 year—old husband, is involved in a car crash. his car overturned, but the royal family says he is not injured. a top north korean diplomat arrives in washington, fuelling speculation of a second summit between kim jong—un and donald trump. thousands take to the streets of the sudanese capital, khartoum, demanding the resignation of president omar al—bashir.