>> reporter: among the victims, logan pennypacker, a devel developmentally disabled man whose parents say his identity was stolen to get $2,600 from the irs. >> you feel personally violated that somebody would stoop to this, to try to gain money out of the system. >> reporter: the irs says it has a system for detecting scams like this, but government auditors say it's often unable to spot them until after the money has already been paid. police in tampa say they're cracking down hard, still puzzled about how they became the capital of tax refund fraud. pete williams, nbc news, washington. >>> when "nightly news" continues, in just a moment, man versus wild, on the hunt for a killer in yellowstone. >>> and later, neighbors helping neighbors, pulling together after a disaster, making a difference in vermont. ld, on th killer in yellowstone. heartburn, right ? you have t yeah, it flares up a few days a week. well, we're the two active ingredients in zegerid otc.

>>> on the broadcast tonight, rainmaker. tropical storm lee bears down on the big easy. folks in new orleans want to know, will the levees hold? >>> labor pain. as americans get ready to celebrate labor day, the job market remains down right dismal. it's a hurt that won't go away. >>> tax scam. identity thieves using turbotax steal millions from the govement. how the brazen scheme was busted. >>> and bear trap. the hunt is on in yellowstone for a killer grizzly. the hunt is on in yellowstone for a killer grizzly. "nightly news" begins now. captions paid for by nbc-universal television