Photos: Stepped-up security at Atlanta airport, MARTA after Brussels attacks
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Atlanta Police officer Laville Parker patrols as travelers make their way at Maynard H. Jackson Jr. International Terminal on Tuesday, March 22, 2016. Bombs exploded at the Brussels airport and one of the city's metro stations Tuesday, killing at least 31 people and wounding dozens, as a European capital was again locked down amid heightened security threats. HYOSUB SHIN / HSHIN@AJC.COM