The bomb scare at a Lake Grove shopping center Tuesday night was unfounded and turned out to be three canisters containing electrical components, Suffolk police said.

The 8-inch canisters, made of rubber on the outside and lined with metal inside, are not unusual in the construction industry, police said. Emergency service officers X-rayed them at the scene, police said.

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But who left them on the east side of the Smith Haven Plaza — and why — is still a mystery.

After the canisters were spotted about 5:40 p.m., authorities evacuated four stores, shut down part of the parking lot and closed off a New Moriches Road between Route 25 to Route 347, police said.

The canisters were discovered near Old Navy, and people had to leave that store along with Trader Joe’s, AT&T and Men’s Wearhouse, police said.

After 90 minutes on the scene, officers gave the nod for business to resume, police said.

The plaza is a short walk to the Smith Haven Mall.