Police say the small explosion in the Cathedral Quarter area of Belfast came after a telephone bomb warning had been made.
The Exchange Street West area in Belfast where the explosion happened is close to many restaurants and bars.
The city centre was extremely busy with shoppers and festive revellers when the incident happened.
UTV News is reporting that Army bomb experts are being sent to the scene of the small explosion in Belfast Cathedral quarter.
There are reports that restaurants and other premises in the area are being evacuated.
UTV News is reporting that police has confirmed there has been a small explosion in the Cathedral Quarter of Belfast.