LEESBURG, Fla. -- Workers fixing the irrigation system at a Leesburg baseball park uncovered an explosive Wednesday morning.

Police said it appears to be a military mortar round, probably from WWII. Workers were digging in the outfield when they found it.

"It apparently is a mortar, one of the larger size mortar devices," explained Major Steve Rockefeller, Leesburg Police Department. "It's approximately four inches in diameter and 14 inches long."

A bomb expert from Patrick Air Force Base is going to examine the mortar. Police believe it's probably a dud, but are taking no chances.