Authorities say they've busted a national heroin distribution ring out of Nashville.

Police say 22 people are facing charges for planning to distribute large amounts of heroin and painkillers throughout the U.S. Agents arrested 21 of those suspects.

Police say the drug ring funneled about a kilogram of heroin worth about $80,000 into Middle Tennessee and nearby areas.

Officials say the resurgence of heroin is a serious problem that they need to tackle quickly.

"Heroin had just about disappeared from Nashville and actually across the nation, but it's back. And since it's back we're addressing this. We want to assure the Nashville public and Middle Tennessee we're on it," said David Rivera, US attorney.

If convicted, those defendants face a mandatory minimum sentence of 10 years to life.