Over 2,000 lower paid civil servants walked out yesterday in Northern Ireland in a row over redundancy compensation.
Pickets were launched across Northern Ireland at the start of two days of action.
Courts, ports, job and tax centres across the UK were hit by the walkout by members of the Public and Commercial Services Union (PCSU).
A rally was also held in support of the strike in Belfast.
PCSU representative Karen Taylor said there had been 90 per cent involvement of staff.
The Government said other civil service unions agreed the changes were fair.
Ms Taylor, who works at Revenue and Customs, said most staff could lose their entitlement to the old redundancy payments. She said the union had come up with alternative proposals to make the savings. – (PA)