LONDON, UNITED KINGDOM - MARCH 24: Mourners attend a candle light vigil to pay tribute to Brussels terrorist attacks victims in Trafalgar Square, London, England on March 24, 2016. (Photo by Tolga Akmen/Anadolu Agency/Getty Images)
LONDON, UNITED KINGDOM - MARCH 24: Mourners attend a candle light vigil to pay tribute to Brussels terrorist attacks victims in Trafalgar Square, London, England on March 24, 2016. (Photo by Tolga Akmen/Anadolu Agency/Getty Images)