Derry’s SDLP mayor John Boyle challenged those responsible on what the aim was.
He said: “I would actually like to ask the people responsible for this what it actually was that they thought they were going to achieve.
“It achieves nothing, it didn’t achieve anything in the past, it didn’t achieve anything right now.
“I have a question for them, what was this all about, because quite frankly this is not something that the people of this city wanted to see, it’s not something they support, and as Mayor of Derry City and Strabane District Council, I have to say I feel it incumbent upon me to speak out on behalf of the vast, vast majority of people in Derry, Strabane and indeed across this island, this is not what we want.
“This is the past and it has to stay in the past. We don’t want to see any more of it.”
Sinn Fein Foyle MP Elisha McCallion has condemned the explosion.
“This incident has shocked the local community,” she said. “In particular, there are many elderly residents who live in the area who have been alarmed.