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A policeman stands on pavement reinforced with glue to prevent the bricks from being dug up and used as projectiles during expected protests outside the central government offices in downtown Hong Kong on May 16, 2016 as authorities prepare ahead of the visit by China's Zhang Dejiang, who chairs China's communist-controlled legislature. Paving stones in Hong Kong have been glued down in an apparent bid to prevent protesters using them as missiles as security was ramped up on May 16 ahead of a visit by a top Chinese official. / AFP / ISAAC LAWRENCE (Photo credit should read ISAAC LAWRENCE/AFP/Getty Images)

A policeman stands on pavement reinforced with glue to prevent the bricks from being dug up and used as projectiles during expected protests outside the central government offices in downtown Hong Kong on May 16, 2016 as authorities prepare ahead of the visit by China's Zhang Dejiang, who chairs China's communist-controlled legislature. Paving stones in Hong Kong have been glued down in an apparent bid to prevent protesters using them as missiles as security was ramped up on May 16 ahead of a visit by a top Chinese official. / AFP / ISAAC LAWRENCE (Photo credit should read ISAAC LAWRENCE/AFP/Getty Images)
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