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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.
Prince Harry has said his expedition team of wounded soldiers have shared "hugs and a few tears" upon reaching the South Pole after a gruelling four-week trek across the Antarctic.
Watch his video message:
UTV News is reporting that police has confirmed there has been a small explosion in the Cathedral Quarter of Belfast.
"A number" of helicopters from the same fleet as one that crashed into a Scottish pub have a problem with their fuel indicators, their aircraft's owner has confirmed.
One of their EC135 helicopters, leased to the police, hit the roof of the Clutha pub in Glasgow last month, killing 10 people.
The firms's 22 remaining type of choppers were grounded yesterday to undergo checks after a technical fault was found in one of them .
The firm's spokesman could not say how many helicopters had the fault, but added that the work was expected to have been completed by Sunday.
London Fire Brigade is asking people to get a takeaway rather than cooking whilst drunk this Friday and Saturday night as the Fire Brigades Union is on strike.
The service says young, well-educated, professionals cause more than a quarter of all accidental house fires in the capital, often by attempting to cook at home when drunk. This greatly increases the risk of someone having a serious fire which could destroy their home or, even worse, kill them
Brigade figures show:
• Two fires a day happen after Londoners have been drinking.
• One in four people who die in a fire has alcohol in their system.
• Three quarters of alcohol related fires are caused by cooking under the influence.
• Over half of these fires happen because someone has fallen asleep.
Firefighters in England and Wales have walked out on strike again tonight in the latest round of action in their long-running row with the government over pensions.
Members of the Fire Brigades Union (FBU) will be on strike for four hours, and again from the same time tomorrow, with the threat of further action in the new year.
FBU members have taken strike action four times in recent months in protest at changes to pensions and their retirement age, which the union argues threatens older firefighters with losing their jobs or having reduced pensions.
Prince Harry has "upped the ante" of royal achievements by trekking for four weeks across Antarctica as part of an expedition to reach the South Pole, his friend Ben Fogle has said.
The TV presenter and adventurer told NBC News that Harry will have "endeared himself to the whole country" by completing the charity trek and "totally transformed" the public view of the royal family.