From ABC7's Eyewitness News:
#BREAKINGNEWS The customs area at Terminal 4 at JFK was evacuated as official investigate a grenade found in a travelers bag.
— Eyewitness News(@eyewitnessnyc) September 27, 2012
UPDATE: More details from ABC. The passenger told officials that the grenade was inert, but the evacuation was carried out as a precaution. The grenade is now being inspected.
The passenger had arrived on a flight from Tel Aviv via Moscow.
UPDATE 2: All clear given after the "grenade" turned out to be a paperweight, according to New York Port Authority.
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