YULEE, Fla. (AP) — Authorities say a construction crew found a rusted mortar shell while doing road work in Florida.

The Florida Times-Union reports that the discovery caused a shutdown on Florida A1A in Yulee Tuesday morning. The Nassau County Sheriff’s Office says traffic was detoured until military experts safely removed it.

Officials say the 60-mm shell was similar to those used by infantry soldiers from World War II through the Vietnam War. Staff from Georgia’s Kings Bay Naval Submarine Base bomb squad checked the shell and declared it safe.

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Information from: The (Jacksonville) Florida Times-Union, http://www.jacksonville.com