The top federal prosecutor in Massachusetts on Tuesday said federal agents raided the New England Compounding Center, the pharmacy linked to a meningitis outbreak that has killed 15 people and sickened more than 200 others.

US Attorney Carmen Ortiz said: "I can confirm that this office and our law enforcement partners are investigating allegations concerning the New England Compounding Center."

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On Tuesday afternoon, agents from the US Food and Drug Administration searched the NECC facility in Framingham, Mass., while local police provided support, local police said.

In a statement, Ortiz said it was "premature" to say what the investigation will show.