A Belgian police officer outside the entrance to the Maelbeek metro station in Brussels on Wednesday. A suicide bomber killed 20 people at the station on Tuesday.
A Belgian police officer outside the entrance to the Maelbeek metro station in Brussels on Wednesday. A suicide bomber killed 20 people at the station on Tuesday. Thierry Roge AP
A Belgian police officer outside the entrance to the Maelbeek metro station in Brussels on Wednesday. A suicide bomber killed 20 people at the station on Tuesday. Thierry Roge AP

Brussels subway attack prompts worry in U.S. about bus, rail safety

March 24, 2016 5:05 PM