UK jobs at Swedish telecoms firm Ericsson are under threat after the company announced plans to cut 10,000 posts worldwide.
More than half the job losses will come from outside Sweden, but the company has not revealed where the cuts will be enforced.
Ericsson employs 1,800 staff in the UK at Burgess Hill, West Sussex, and Basingstoke, Hampshire.
The announcement follows the mobile phones giant reporting a first quarter pre-tax loss of £333m, reflecting the depressed state of the telecoms market. Ericsson refused to say which sites in the UK may be affected.
Bob Shannon, national officer for the Amalgamated Engineering and Electrical Union (AEEU), said, "We want to avoid any compulsory redundancies.
"The union has an ongoing dialogue with Ericsson and we want to pursue a number of alternatives to job cuts, such as outsourcing or joint ventures."