(SOUTH CHINA MORNING POST) — Twenty pupils at a Beijing primary school were wounded on Tuesday in a hammer attack that police said had left three seriously injured, state news agency Xinhua reported.

Police in the Xicheng district of the city said in a statement on Weibo that they had detained a 49-year-old male suspect surnamed Jia, who was a former repair worker at the school.

Jia was a migrant worker from Heilongjiang province whose contract had ended at the start of the year, and police suspect that the attack was motivated by anger at having his employment terminated.

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