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Two people have been injured in an ongoing shooting incident at a high school in the US state of Colorado, NBC News has reported.
Police said an "active shooter situation" was occurring at Arapahoe High School in Centennial.
The explosion in the Cathedral Quarter of Belfast occurred as officers were clearing the area after receiving a telephoned bomb warning, UTV has reported.
The warning was phoned into the Irish News at around 6pm before the bomb partially exploded just before 7pm in the Exchange Street West area.
It is understood the incident was not a car bomb attack, with officers believing a small-scale device was used.
A Police Service of Northern Ireland spokesman has said:
A number of businesses and streets in the Cathedral area of Belfast have been cordoned off following a small explosion.
It occurred at about 6.45pm as police were checking reports of a suspicious object.
At this stage there are no reports of any injuries.
UTV News producer Conor Shanley has posted an image of the cordoned-off scene near to the small explosion in Belfast city centre:
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.
US authorities have arrested a man who they claim was plotting to blow up the Mid-Continent Airport in Wichita, Kansas, with a carload of explosives.
Kansas District Attorney Barry Grissom told a news conference that the 58-year-old aviation technician intended to die a martyr in the bombing.
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.