BBC staff are to stage a further 24-hour walkout on February 26 over compulsory job cuts.
The strike is in protest at five compulsory redundancies in BBC News and three in other departments as part of director general Mark Thompson's "value for money" cost savings.
Broadcasting union officials said further industrial action was inevitable after they failed to reach agreement with management last Tuesday over compulsory job cuts.
On February 26, 4,000 National Union of Journalists members will be expected to strike across radio, online and television, including BBC News.
Technicians' union Bectu's 600 members are also walking out on February 26.
The imposed redundancies include two of Newsnight's 15 correspondents, who have been asked to reapply for their jobs.
However, Newsnight journalists have written to the editor, Peter Barron, saying they will not co-operate with the BBC's compulsory redundancy plans.
Three compulsory job cuts are also being imposed outside BBC News, two in BBC People and one in the corporation's new media department.
NUJ broadcasting official Paul McLaughlin said: "We are calling on the BBC to see sense even at this late stage because we have offered sensible solutions to all of the outstanding cases. Management intransigence seems to be cause of this dispute."
Bectu official Luke Crawley added: "The BBC has achieved almost 4,000 job losses through voluntary measures and it seems madness to try to force through fewer than 10 compulsory redundancies.
"Bectu members are intent on taking strike action to protect their colleagues."
The union is also involved in a separate disagreement at the BBC over working practices for staff who work in news production. Around 90 union members will carry out stoppages for three days from February 27 in relation to this dispute.
The compulsory redundancies are thought to be the first at the BBC for a decade.
A BBC spokeswoman said: "We note the decision with regret but we have an obligation to licence fee payers to implement our value for money efficiency savings. The BBC remains committed to trying to achieve these savings without the need for compulsory redundancies and we are still in discussions with Bectu and the NUJ about how this might be achieved.
"The decision to take industrial action is particularly disappointing given that the BBC has been working extremely hard together with the joint unions to achieve as much as possible through voluntary means.
"The vast majority of the value for money post closures achieved to date (over 1,500) have not been through compulsory redundancy. We will of course implement contingency plans to minimise any disruption to viewers."
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