FLAGLER BEACH, Fla. -- A Flagler Beach swimmer's discovery of a box marked "grenade" with 18 live shells inside prompted authorities to evacuate five homes, two businesses and close several nearby streets Monday night, according to police.

Officers said the woman swimmer found the ammunition-size box containing the explosives on South 19th Street and South Oceanshore Boulevard.

Police said she put the container with explosives in her car and traveled to a phone and called for help.

When Flagler County fire officials arrived, they noticed the package and called the Volusia County bomb squad.

"The box had "grenade" written on the side of it," Flagler Beach Fire Chief Martin Roberts said. "And they didn't want to handle it. We took one look at it and decided that it was not something we wanted to deal with."

Local 6 showed video of a Volusia County bomb squad robot removing the top of the box early Tuesday.

Officials said the 18 live shells were transported to the Cape Canaveral Air Force range were they were to be detonated Tuesday.

Roads closed because of the discovery were reopened to traffic early Tuesday.

Watch Local 6 News for more on this story.