Police are questioning four people after explosive materials were found today in a house in the Soundview section of the Bronx.
Police Commissioner Ray Kelly said police raided a home on Stratford Avenue and found a fragmentation grenade and a military stun grenade.
They also found raw material that can be used to make explosives.
Kelly said the raid resulted from a tip about illegal guns.
"It's a concern, of course, and this was excellent information that was received, proved to be a fruitful warrant execution," Kelly said.
The commissioner said police are still investigating what the people in the house intended to do with the explosives.