European Union flags blow in the wind at half-staff outside EU headquarters in Brussels on Tuesday, May 23, 2017. The flags were set at half-staff to remember those killed and injured in the attack ...

European Union flags blow in the wind at half-staff outside EU headquarters in Brussels on Tuesday, May 23, 2017. The flags were set at half-staff to remember those killed and injured in the attack at an Ariana Grande concert in Manchester on Monday