Colonel Bob Stewart has said it is "absolutely immoral" to consider that "people who have committed murder" in Northern Ireland should have the threat of prosecution taken away.
The Conservative MP served in Northern Ireland from 1971 and was one of the first responders to the Droppin Well bombing in 1982, which killed 17 people.
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A second Scottish independence referendum is "even more likely" after Theresa May's Brexit speech, Nicola Sturgeon has said.
At least 100 people are feared dead in the bombing including soldiers and Nigerians working for Doctors Without Borders.
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