US President Barack Obama has said the investigation into the New York and New Jersey explosions is "moving rapidly" but played down their connection with a recent stabbing spree at a Minnesota shopping mall.
Speaking from New York where he is attending the UN General Assembly, Mr Obama said he had been closely monitoring developments following the weekend bombing in Manhattan and pipe bomb explosion in New Jersey.
While he suggested neither was linked to the Minnesota attack, he confirmed a police statement that the stabbings at Crossroads Center in the town of St Cloud was also being investigated as a potential act of terrorism.
Mr Obama said extremists cannot undermine the American way of life as he called on the public to report any suspicious activity to law enforcement.
Authorities are investigating whether Ahmad Rahami, who was not on US counter-terrorism lists, acted alone or as part of a terror cell.
Investigators studying CCTV footage may have identified the same man at each location, law enforcement sources reported to have said.
At least 29 people have been injured in an explosion which rocked Manhattan. Here's what we know so far.