A forensic officer inspects the scene of a suspected auto bomb in Londonderry, Northern Ireland January 20, 2019.
The Police Service of Northern Ireland posted a photograph of a vehicle in flames and urged the public to stay away.
Two men have been arrested by police investigating a vehicle bomb attack in Northern Ireland.
The series of tweets shows the vehicle being driven to the courthouse, the driver running away from the auto, and then the auto exploding.
The third shows a large group of young people walking past the vehicle, as well as another auto driving past.
"It was a significant attempt to kill people in this community".
She said: 'This incident has shocked the local community.
The PSNI is appealing to anyone with information to please get in touch with them.
Police evacuated everyone in the area just before the bomb went off and no one was injured.
Forensic officers inspect the remains of the van used as a auto bomb on an attack outside Derry Court House on January 20. Law enforcement officials say the main line of inquiry is that the "New IRA" is behind the attack.
"These are by their very nature, inherently unstable devices, and history tells us that they can detonate prematurely, whilst being assembled or transported".
Police have confirmed to Independent.ie that they arrested two men, both aged in their twenties, in the Derry city area this morning.
The New IRA is believed to have been responsible for a number of attacks in Londonderry in recent years.
The Northern Ireland secretary, Karen Bradley, said she was concerned at the reports coming from Londonderry and was "being kept informed by PSNI". The small number of people responsible have absolutely nothing to offer Northern Ireland's future and will not prevail.
A suspicious vehicle was spotted on Bishop Street by officers on patrol at about 19:55 GMT, police then received a warning five minutes later.
"Our voices across the political spectrum are united".
The Republic of Ireland's deputy premier Simon Coveney tweeted his disgust at the incident.
The DUP leader, Arlene Foster, also condemned the "pointless act of terror".
He said: 'The New IRA, like most dissident republican groups in Northern Ireland, is small, largely unrepresentative, and determined to drag people back to somewhere they don't want to be.
Sinn Fein MP for Foyle, Elisha McCallion, said the incident was "not representative of the city", and mayor John Boyle called on those responsible to reveal what their aim was.
Colin Neill, chief executive of industry group Hospitality Ulster, said hotels and bars "have bounced back straight away".