BRUSSELS—U.S. and Belgian officials have grown increasingly worried about the prospect that a key figure behind the 2016 Brussels bombings is plotting a new terror attack, according to people briefed on the investigation.
Wall Street Journal: Fugitive spurs worries over new Brussels terror attack
A police officer patrols near a tramway train after it was evacuated during an anti-terrorist operation in the Schaerbeek - Schaarbeel district in Brussels on March 25, 2016.
