IED thrown during protest in New York City

New York Police Department Bomb Squad officers search a car allegedly belonging to an individual who attempted to throw a home-made explosive at police officers. Pic/AFP

A device thrown by a counter-protester at an anti-Islam demonstration in New York City on Saturday was confirmed to be an improvised explosive, according to a preliminary police analysis.

As the investigation continued on Sunday, police said they were looking into a second suspicious device found in the same area of Manhattan's Upper East Side.

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