A police officer guards metal fencing erected as tents are set up behind, on the end of Rollestone Street, the location of the John Baker House for homeless people in Salisbury, England, Thursday, July 5, 2018. For the second time in four months, two people lie critically ill in England's Salisbury District Hospital after being exposed to a military-grade nerve agent developed in the Soviet Union, British police confirmed late Wednesday. (AP Photo/Matt Dunham)
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