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
The British public have voted St Paul's Cathedral the country's favourite building ahead of Stonehenge and Buckingham Palace.
A service to remember 'Operation Dynamo', the code name for the mass evacuation of allied troops in 1940, will take place on the beach.
The Bank of England has launched a secret project looking at the economic risk to Britain if the country votes to leave the European Union.