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A DEATH threat against under-pressure Scottish Lib Dem MP Alistair Carmichael is being investigated by police.

The threat is understood to relate to Carmichael’s backing for air strikes in Syria and was contained in a letter delivered to the Liberal Democrat’s constituency office in Orkney on Thursday.

The former Scottish Secretary has been the focus of an online hate campaign since admitting he was behind a leaked memo written by a civil servant which suggested First Minister Nicola Sturgeon wanted David Cameron to win last May’s general election.

Just last week he was cleared in a special election court of deliberately misleading voters over the leak in an action brought four constituents who called themselves the “Orkney Four”.

(Image: SWNS)

The MP is now preparing to claim £150,000 of legal costs from the complainants who have crowd-funded their legal action.

A Scottish Liberal Democrat spokeswoman confirmed the death threat did not refer to the memo leak.

Police are understood to have ruled out any link to terrorism in connection with the letter.

The threat comes as a Labour MP cancelled her constituency surgery this week over a “threat” made against her.

Yorkshire MP Anna Turley said she will “not jeopardise the safety of staff or constituents” at the regular event on Friday.

A number of Labour MPs have reported to be the subject of death threats on social media following their support for the bombing of ISIS in Syria.