A commemoration ceremony is held for the victims of the Sept. 11 terrorist attacks on Sunday at the National September 11 Memorial and Museum in New York City. Spencer Platt /Getty Images hide caption

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Spencer Platt /Getty Images

Baton Rouge police block Airline Highway after police were shot in Baton Rouge, La., on Sunday. Several law enforcement officers were killed and several injured in a shooting in Baton Rouge on Sunday morning. Max Becherer/AP hide caption

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Max Becherer/AP

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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Dirk Waem/AFP/Getty Images

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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Connor Mulvaney /Pittsburgh Post-Gazette/Landov