PORT ST. LUCIE, Fla. (CBS12) — There is heavy police activity at a shopping center in Port St. Lucie on Tuesday morning.

CBS12 News has been on the scene on Port St. Lucie Boulevard near Southeast Morningside Boulevard, where the Boulevard Shoppes shopping center has been closed off by officers with crime scene tape.

Sergeant Mesiti, Public Information Officer with the Port St. Lucie Police Department, tells us shots were fired overnight by a nearby pub.

Sgt. Mesiti says a disturbance occurred around 2:15 a.m. Tuesday morning, outside of Harpers Pub, located in the Morningside Shoppes plaza.

He says four patrons of the pub were in the nearby parking lots when shots rang out.

Once police arrived, officers detained three adult males and one adult female.

All four people involved are currently being questioned.

Nobody was injured, and there is no threat to the community.

Officials say recovered four shell casings.

A Port St. Lucie crime scene vehicle was parked in the plaza along with forensic photographers who were out taking photos and documenting the scene throughout the morning. Investigators were seen going through a car parked in the Boulevard Shoppes too.

Sgt. Mesiti tells CBS12 News that no charges or arrests have been made in this case, and that the investigation is still very active and in its early stages.

Certain entrances of the Boulevard Shoppes plaza are starting to reopen around 9:30 a.m. Tuesday morning for business owners and guests.

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