DUP MLA Jonathan Craig has condemned the blast in a busy area of Belfast city centre as "absolutely reckless".
UTV News reports him saying that there was "an explosion as the area was being cleared" and that it was a "miracle" if no one had been injured.
There is no confirmation of this from the police and there are no reports of any injuries, UTV says.
More top news
Tonight turning foggy in places but frost free
Governor says Article 50 fears not Bank actions to blame for pound's plunge, but admits markets may yet have "mistaken" Brexit impact.
Conservative MP Zac Goldsmith read out a statement on his decision to force a by-election in protest at new runway at Heathrow Airport.