see more

Armed police patrol outside a currency exchange at St Pancras International railway station in London, U.K., on Tuesday, March 22, 2016. Explosions ripped through the Brussels airport departure hall and a downtown subway station on Tuesday morning, causing deaths and injuries and spurring fears of imminent follow-up attacks in the capital of the European Union. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

Armed police patrol outside a currency exchange at St Pancras International railway station in London, U.K., on Tuesday, March 22, 2016. Explosions ripped through the Brussels airport departure hall and a downtown subway station on Tuesday morning, causing deaths and injuries and spurring fears of imminent follow-up attacks in the capital of the European Union. Photographer: Chris Ratcliffe/Bloomberg via Getty Images