Five people were killed and at least 20 injured in London after a car ploughed into pedestrians and an attacker stabbed a policeman close to the British parliament in what police called a "marauding terrorist attack".
Severe droughts give way to some of the country's most devastating downpours in decades.
Major moments from the first days of the Trump administration.
Followers of the Persian calendar celebrate Newroz, marking the arrival of spring and the new year.
The varied roles of drones.
Celebrating the spring equinox and the end of winter.
The first guests arrive at Banksy's Walled Off Hotel in the West Bank city of Bethlehem.
The coffin of the IRA peacemaker is carried through the streets of Londonderry, Northern Ireland.
Iraqi forces enter Mosul's Old City as Islamic State militants put up fierce resistance from the close-packed houses and narrow streets.