They seized 50 firearms and 600,000 rounds of ammo. The article claims "snipers" use tracer and armor piercing ammo. BS. Tracers are placed into belted ammo for night firing of machine guns to get a sense for where the rounds are striking. A sniper shoots a single, precisely aimed round at a single target. An AP round might be appropriate in special circumstances.
The whole story is a lot of sensationalist anti-gun pablum from an Illinois newspaper. Thanks to Mayor Daley and Gov Blagojevic for the continuous assault on 2nd amendment rights.
BTW, the 69 year old owner of the guns and ammo committed no crime except mere possession. No mention was made of whether the "machine gun" was a demilled curio and relic which is completely legal for anyone to own.
I wondered if he was an old military weapons collector. At 69 years old, I doubt he's a loose cannon.
It was big news around here though. ;-)