Large crowds of employees are gathering outside the Athens headquarters of Greek state broadcaster ERT to protest the government's decision to suspend its service.
Some have called for a general media blackout in protest at the decision.
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According to local reports, the repairman had failed to disconnect the power to the escalator before getting to work.
Millwall fans who caused problems at the match against Barnsley could face lifetime bans, the club said.
Counter-terrorism forces, backed by Shi'ite militias on the ground and coalition airstrikes, are moving into the city on several fronts.