It's feared the Dublin Bus strike could escalate into an all out stoppage.
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Drivers are manning pickets again today – as 400,000 commuters deal with a second day of disruption.
The NBRU is warning that its members are prepared to see their strike through to the bitter end.
Two more 48-hour strikes are planned for this month amid calls for a 15 per cent wage hike.
The union's Dermot O'Leary says an escalation would be appalling
