The Police Service of Northern Ireland has confirmed it arrested four men in a car on the Foyle bridge late last night.
The police say several items were recovered from the car, but further details are not yet available.
The bridge, which was closed after the four men were seen acting suspiciously, has been reopened.
Elsewhere, army technical officers are continuing to examine a hijacked van, which has forced the closure of the Derry to Strabane road.
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The van was hijacked by armed and masked men.
The incident in the Waterside area of the city led to the evacuation of 60 families from their homes. They may be allowed to return later this morning.