At least 25 people suffered minor injuries in an explosion in a busy part of New York in a blast that the city's mayor said appeared to be intentional but with no "terror connection".

"There is no specific and credible threat against New York City at this point in time from any terror organisation," Mayor Bill De Blasio told a news conference. 
De Blasio said that while the injuries were significant, none of those injured were likely to die. 

Police spokesman J Peter Donald said on Twitter that the explosion happened at about 8:30pm on Saturday on West 23rd Street in the Chelsea section of Manhattan.

He said several people were taken to hospitals with injuries. The Fire Department tweeted that none of the injuries appear to be life-threatening.

The Chelsea neighbourhood is a residential area popular for its nightlife, and is not near any major tourist sites or government buildings. 

"There's a massive emergency response taking place in downtown Manhattan," Al Jazeera's Kristen Saloomey reported from New York. "The street is blocked off and people are being stopped.

"Witnesses reported hearing a loud bang."

Source: Al Jazeera News And Agencies