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ATTLEBORO - Master thieves operating with military-like precision broke into a city jewelry company, stealing up to $2 million in gold, diamonds and jewelry - including New York Giants Super Bowl rings - in one of the largest heists in Attleboro history.

The burglary occurred sometime over the weekend at E.A. Dion at 33 Franklin McKay Drive, and is under investigation by city police detectives.

The perpetrators disabled the building's alarm system, cut a hole in the roof and made off with a safe that weighed at least 1,000 pounds, police said.

The burglary was discovered Sunday by an employee. Police say there are no immediate suspects.

Police Capt. David Proia Tuesday declined to comment extensively on the heist, other than to say detectives were pursuing the investigation. "They are actively investigating this," Proia said.

"Whoever did this knew what they were doing," he acknowledged.

An employee discovered the burglary Sunday after she was unable to access her work e-mail from home, apparently because the Dion phone lines were cut by the thieves when they disconnected the alarm system.

Police say the heist is believed to have occurred sometime since Saturday.

Detectives Richard Campion and James Cote are leading the investigation and took evidence from the scene with the assistance of state police.

Police officers Raymond Russas, John Hynes and Timothy Cook Jr. also assisted.

Company President Edward "Ted" Dion Jr. said Tuesday the company is cooperating with investigators, adding that the break-in was "unpleasant" but only briefly hampered operations.

"The good news is that we're back up and running," Dion said. "We're mainly focused on supplying our customers as we normally do."

When asked about how deliveries would be affected, such as the Super Bowl rings, Dion said, "I'm not going to discuss specifics. Our biggest customers understand we've run into a bit of a hiccup."

He complimented his employees and said "everybody is positive." While many jewelry manufacturers in the city have either moved or gone out of business, the family-owned E.A. Dion company is celebrating its 40th anniversary this year, in part by transforming its business.

With origins as an advertising and promotional specialties company, Dion now designs, makes or markets a wide variety of products from high-dollar corporate and commemorative rings to recognition products.