Police patrol outside the council chamber of Brussels on Thursday during ongoing investigations into the Paris and Brussels terrorist attacks. More than 30 people have been identified as being involved in a network behind the Paris attacks on Nov. 13, with links now established to this week's bombings in Brussels. Dirk Waem/AFP/Getty Images hide caption

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Brussels Unites In Grief As Search For Attacker — Or Attackers — Continues
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At Mother of Sorrows Catholic Church in Murrysville, Pa., on Wednesday evening, worshipers held candles as they prayed for those injured in a stabbing attack at the local high school. Connor Mulvaney /Pittsburgh Post-Gazette/Landov hide caption

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