Kris Wu was being investigated over accusations made online of "tricking young girls into having sex with him," according to a statement by police in Chaoyang.
A male suspect was brought "under control" and the wounded students were taken to hospital, three of them seriously injured. The attack was in the Xicheng district of the capital, Beijing. The assailant was arrested and is being questioned.
Police officials said they were testing the poisonous gas that killed the workers and had detained an unspecified number of people in connection with the incident.
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