Former Chongqing police chief Wang Lijun has been sentenced to 15 years imprisonment for defecting and other crimes.
He sparked a political scandal when he disclosed the murder of British businessman Neil Heywood.
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The maintenance worker spent 10 days in hospital after plunging 9.5 metres from a scaffold tower at a disused station.
Workers and managers are to stage another strike on Saturday amid a long-running dispute over jobs, pensions and closures.
The unexpected call could prompt a diplomatic rift with China, which regards Taiwan as a breakaway province from its mainland.