A food processing plant in Corby is to close in the summer with the loss of 900 jobs.
Although 500 job losses had already been threatened at Solway Foods, discussions had been continuing to try to save the factory.
Solway Foods is the town's second largest employer, but the company says the factory, which opened in 1988, is no longer viable.
The Corby MP Andy Sawford says the announcement of the closure of the Solway Food factory with the loss of 900 jobs makes it a "really bad day for the whole town."
Mr Sawford said they're now looking at ways of helping the workers who will lose their jobs.
A jobs fair is being held on Thursday with 30 companies offering new employment opportunities.
Statement from Solway Foods
"It is with much regret that we can confirm that, following a 45 day consultation period, we are closing our Solway Foods site in Corby.
During consultation we have fully explored all the options available to us. Sadly, the fact remains that the site is no longer viable.
Our priority now is to minimise the number of compulsory redundancies through voluntary redundancies or, where appropriate, redeployment elsewhere in the Group. Along with the Task Force we will also help to find alternative employment outside the company. A number of other local employers are liaising with the Task Force to help meet their own recruitment needs.
Solway Foods would like to thank everyone involved with the Corby Task Force for their help during this difficult time, which has been invaluable.
We will now work with our colleagues and customers to implement a phased closure. By April 5th phase one is expected to be complete. Phase 2 and site closure is expected to be complete by late summer."