New York remains on high alert today as a series of "intentional" explosions and suscipious devices were found over the weekend.
Five men have been detained for questioning in relation to the incidents.
The blast in the Chelsea area of Manhattan, which injured 29 people, is believed to have been from a shrapnel-filled pressure cooker.
On Sunday a pipe bomb exploded in New Jersey along the route of a charity run.
Another suspicious device was found near a train station in Elizabeth in New Jersey on Monday morning. The device exploded as it was being disarmed.
On Tuesday world leaders are expected to gather in New York for the UN General Assembly.