Londonderry bomb: Four arrests over 'reckless' attack
https://www.bbc.com/news/uk-northern-ireland-46937061
https://www.bbc.com/news/uk-northern-ireland-46937061
Police in Londonderry have arrested a further two men in connection with a bomb in the city on Saturday.
The men, aged 34 and 42, were arrested in the city on Sunday evening. It followed the arrest of two men in their 20s earlier in the day.
The PSNI said the attack may have been carried out by dissident republican group the New IRA.
A pizza delivery van was hijacked by two armed men in Derry at about 18:00 GMT.
The bomb, which went off at 20:09 GMT, was described as a "crude device". The PSNI said the attack outside the courthouse was "unbelievably reckless".
Assistant Chief Constable Mark Hamilton said the van, with the bomb inside, was left outside the courthouse on Bishop Street at 19:23 GMT.
Image copyrightPACEMAKERImage captionA forensic officer at the scene of the explosion on Sunday morning![]()
Three minutes later, a warning was called into the Samaritans in the West Midlands. It was passed to West Midlands police, who contacted the Police Service of Northern Ireland.
"In the intervening minutes we had already found the car and were starting to evacuate the area," said ACC Hamilton.
"Clearly, it was a very significant attempt to kill people here in this community.
"Thankfully, the local community and the police service acted bravely together and we got everybody away just in time.
"But the bomb detonated just as we were leaving the area.
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Media caption"Bomb was act of hatred for this city and the people in it"
Two arrested over 'reckless' Derry bomb
"The new IRA, like most dissident republican groups in Northern Ireland, are small, largely unrepresentative and determined to drive people back to somewhere they do not want to be."
A cordon remains in place at the scene.