Construction workers at the San Diego International Airport’s Terminal 1 dug up a grenade Thursday, prompting a response from law enforcement.

In a surprising discovery, construction workers at San Diego International Airport unearthed what they believe to be "an old, inert hand grenade" in the area of Terminal 1, a spokesperson for the Port of San Diego confirmed Thursday afternoon.

The incident did not impact the airport's operations since the ordnance did not have the capability to explode, the Port says.

The NTSB report on that runway incursion has not yet been released.” The story continued, “In May, airport officials and other experts also warned that adding more daily flights under what’s known as the slot-and-perimeter rule posed concerns.

Before the new Terminal 1 opens later this year, people should plan for another round of construction-related traffic interruptions when driving in and out of the airport.

Southwest Airlines added a fourth nonstop destination to its routes to and from Fresno Yosemite International Airport.