NASHVILLE, Tenn - Terror attacks around the world last week have prompted the FBI to issue a nationwide alert for the 4th of July holiday.
Law enforcement in Nashville have now stepped up security for what is expected to be the biggest fireworks show in the country.
There are no specific locations mentioned in the FBI's alert, but ISIS has called for more lone-wolf attacks during the month of Ramadan.
Monday on CBS This Morning, former Deputy CIA Director Michael Morell said this threat really worries him.
"I don't want to tell Americans what to do or what not to do," Morell said. "But I wouldn't be surprised if we were sitting here a week from today talking about an attack over the weekend in the United States. That's how serious this is."
In Nashville, organizers of Let Freedom Sing say there will be plenty of security, but people attending will be the best eyes and ears for law enforcement.
"We urge people coming downtown over the weekend to treat your belongings, coolers, satchels, whatever, as if you were in an airport," said Metro Police Spokesman Don Aaron. "Don't leave them unattended. If you're walking down Broadway on Saturday afternoon and you see a cooler at the corner of 2nd and Broadway with no one around, let a police officer know."
Butch Spyridon with the Nashville Convention and Visitor's Corporation said Fourth of July celebrations downtown always have strong security.
"Fourth of July is a pretty big date in this country," Spyridon said. "We've always thought of it as a target type date."
The Bureau of Alcohol Tobacco Firearms and Explosives said it is tracking any fireworks or other explosives that may be stolen, even if it is outside of this area because they can travel easily.
There are no known threats against Nashville's Fourth of July celebration.