A man has been arrested in connection with the murder of a construction worker at a Territorial Army base outside Derry last week.
He was detained in the Sion Mills area of Co Tyrone this morning by detectives probing the murder of Mr David Caldwell last week.
The "Real IRA" have been blamed for the attack.
Detectives are to revisit the scene of the murder on the Limavady Road tonight between 10.30 pm and midnight.
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Several hundred people walked from the camp to the city's Guildhall Square on Monday in protest at the killing.