New York City Police Commissioner James O'Neill, front row, third from left, speaks at a news conference with Acting Brooklyn District Attorney Eric Gonzalez, front row, third from right, Wednesday, March 8, 2017, in the Brooklyn borough of New York where they displayed guns and assault rifles confiscated in what they called the largest sting operation in Brooklyn's history. An undercover cop in New York City bought 217 assault weapons, tommy guns and handguns, dismantling a trafficking ring that exploited Virginia's looser gun laws and sent sellers north on buses with bags full of weapons, prosecutors said. (AP Photo/Colleen Long)