The van had its roof cut back to allow the mortars to be fired
A fourth man has been arrested by police over the discovery of four mortar bombs in a van in Londonderry.
The 31-year-old was arrested in the city on Tuesday.
Three other men arrested after the mortars were discovered in a van on the Letterkenny Road on Sunday night are still in custody.
The van had its roof cut back to allow the mortars to be fired. Police believe dissident republicans were within minutes of firing them.
They said the mortars were “primed and ready to go”.
Two men, aged 35 and 37, were arrested at the scene at 20:15 GMT on Sunday. One was in the van and the other was riding a motorcycle travelling behind.
A 37-year-old man was arrested later after a house was searched.
About 100 families had to leave their homes at Letterkenny Road during the overnight alert.
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