Five hundred jobs are to be lost in Northern Ireland with the closure of an oil field services company in Co Antrim and the latest in a series of job cuts at aerospace firm Bombardier.

Bombardier is planning to cut another 280 jobs at its Northern Ireland operations, the Unite union has said.

It is the latest in a series of redundancies as part of a five-year plan for the company to cut costs and increase profitability.

Meanwhile, 220 jobs are to go with the closure of Schlumberger's factory at Newtownabbey, on the northern outskirts of Belfast.

Schlumberger is a leading provider of equipment for oil and gas producing companies. The plant is set to shut down next year.

"Due to the current prolonged downturn in the Oil and Gas industry, Schlumberger's manufacturing plants globally are under-utilised and the company is considering a proposal to cease manufacturing, assembly and test activities in its Belfast plant during 2018," the company said.

"We completely understand the impact of this announcement on our employees and the local community.

"This is only a proposal at this stage and we will be conducting consultation with the union and our employee representatives to make every effort to try and mitigate as much as possible the impact on our employees."

Last year, Canadian-based Bombardier said it was cutting 1,000 jobs in Northern Ireland, around a fifth of its workforce there.

Bombardier, which employs almost 5,000 people in Belfast and accounts for 10% of Northern Ireland's manufacturing exports, is facing significant costs in the fallout with US aeronautics powerhouse Boeing.

A further 100 jobs were cut at the company's Belfast base last month.

The dispute with Boeing centres on allegations that Bombardier received subsidies allowing it to sell its C Series planes at below-market prices.

European aerospace giant Airbus announced last week that it will take a majority stake in Bombardier's marquee C-Series airliner programme.

However, Boeing has said that the C Series jets could still be hit with high US import duties, even if they are assembled in Alabama following the Airbus deal.

Around a quarter of the workforce in Belfast work on the C-Series, manufacturing the wings, and unions have been warning of pressures on other areas of Bombardier's work away from the C-Series.