Talks between British Airways and union leaders were brought to an abrupt end when protesters stormed the meeting.
Dozens of demonstrators from the Socialist Workers Party staged a sit-in at the London offices of the conciliation service Acas.
It is not known how much progress was made in the last-ditch talks aimed at averting strikes by cabin crew.
The latest strikes follow a long-running dispute over jobs, pay and working conditions.
Full story: BBC News – BA and union talks stopped by protesters