Freddie Scappaticci, 72, the man alleged to be the British Army's notorious IRA agent Stakeknife, has been arrested by police investigating murders and other offences linked to the republican organisation's internal security unit, the Press Association has reported.

An English police chief tasked to investigate more than 50 murders linked to the Army's notorious IRA agent Stakeknife has pledged to leave no stone unturned in his quest for truth and justice.