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The Schlumberger Rosharon Technology Center. Image courtesy of Schlumberger.

Employees at Schlumberger’s research and development center south of Houston were forced to evacuate Thursday after a receiving a bomb threat.

Schlumberger said a package “containing a bomb threat” was delivered to the company’s Rosharon Technology Center in Brazoria County.

About 500 employees were evacuated.

“All employees have been safely evacuated and local police and bomb squad personnel are onsite investigating,” Schlumberger said.

Employees were given the all clear to reenter the building Thursday after local officials determined the threat was not credible.

The company will release more information as it becomes available.

The Joint Terrorism Task Force is reportedly helping with the investigation.

The Rosharon center specializes in new product development, sustained engineering for commercial products, Rapid Response projects to meet specific client requirements, and reliability testing under simulated downhole conditions.