Syria's state news agency is reporting that rebels have fired rockets "containing chemical substances" in an attack in the northern province of Aleppo which it said killed 15 people.
The SANA news agency has repeatedly referred to rebel fighters as "terrorists". There has been no confirmation from rebel sources so far.
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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.