A military spokesman has said three people are now dead following a shooting and subsequent stand-off at Marine Corps Base Quantico in Virginia. He said the suspect in understood to have died from a "self-inflicted wound".
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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.