Police investigating the car bomb explosion in Londonderry are continuing to question five men.
The attack, which the PSNI described as “unbelievably reckless”, happened outside Bishop Street Courthouse on Saturday evening.
No-one was injured but CCTV footage showed a group of young people walking directly past the vehicle a short time before it exploded.
Police have said that their main line of inquiry is that the dissident republican group, the New IRA, are behind the attack.
Two men aged 34 and 42 and two men aged 21 were arrested on Sunday and all four currently remain in custody.
A fifth man, aged 50, was arrested under the Terrorism Act by police investigating the explosion, and also in connection with an armed robbery in Meadowbank Avenue on 15 January.
Police said they “recognise the significant impact that the events of the weekend have had on so many people in the city”.
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Cordons remained in place for most of the day in the Bishop Street area, but police said the area is now reopened.
Meanwhile the Department of Justice said the courthouse is closed on Monday, and jury trials due to be held there are now taking place on Tuesday.
Police added: “Listening to the voice of the people the resounding message is revulsion at the extent to which those behind it have stopped only harming the harming the city and the people."