A fresh wave of postal strikes will be held next week in an escalation of the bitter Royal Mail dispute, union leaders have announced.
The Communication Workers Union served notice of further walk-outs starting next Thursday as thousands of postal workers manned picket lines on Thursday in the first of two 24-hour walk-outs.
The union also offered "unconditional" talks at the conciliation service Acas in a bid to break the deadlocked row over jobs, pay and modernisation.
Details of how long the new strikes will last and which group of workers will be involved will be announced in the coming days.
Mark Higson, Royal Mail's managing director, said it was "appalling but sadly not surprising" that more strikes had been called.
The new stoppages will cause further disruption to mail deliveries, which are already facing big delays because of this week's action.
Prime Minister Gordon Brown urged Royal Mail management and postal workers to get "round the table" to solve the dispute and said the strike was "self-defeating".
Mr Brown, who was speaking during a walkabout in the centre of Wakefield, West Yorkshire, warned: "If more and more customers leave the Royal Mail and more and more customers stop using the Royal Mail, then more jobs will be lost, so this is self-defeating."
Up to 42,000 mail centre staff and network drivers launched a 24-hour strike on Thursday, while 78,000 delivery and collection workers will walk out on Friday. The union said the walk-out was "solidly supported" as leaders stepped up their attack on Business Secretary Lord Mandelson, accusing him of telling "untruths".
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Lord Mandelson urged both sides to continue talking until the deadlock was broken and raised the prospect that the conciliation service Acas could become involved.
