PSNI say people evacuated "just in time" moments before a car bomb exploded outside a courthouse in Derry/Londonderry

The PSNI say people were evacuated "just in time" moments before a car bomb exploded outside a courthouse in Londonderry at the weekend. It's believed police were just leaving the area when it went off. It's being linked to a group calling itself the 'new IRA' and four people have been arrested. Stephen spoke to PSNI Assistant Chief Constable Mark Hamilton and got reaction from SDLP leader Colum Eastwood, Alliance Party leader Naomi Long, Sinn Fein MLA Raymond McCartney, DUP MLA Gary Middleton and UUP Cllr Derek Hussey.