Explosion at Guildhall Square in Derry

There has been an explosion at Guildhall Square in Derry.

It happened at about half past three this morning.

The cause of the explosion has yet to be established. It is understood it happened near the City of Culture office, which is at Waterloo Place.

Foyle MLA, Pol Callaghan, says this attack, was an attack on the City of Culture: