A federal grand jury is investigating whether the murder last year of Dr. George Tiller, one of the nation’s few late-term abortion providers, was connected to a broader case involving radical anti-abortion activists, according to a federal law enforcement official familiar with the case.

The official spoke Friday to The Associated Press on condition of anonymity because he was not authorized to publicly discuss the investigation. The official said federal civil rights prosecutors were holding grand jury proceedings in Kansas City, looking into whether a broader case surrounded Tiller’s death.

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Tiller was fatally shot in his Wichita church in May 2009 by anti-abortion activist Scott Roeder, who admitted to the shooting and is serving a life prison sentence.

“Yes, there is a grand jury investigation. I can tell you that there are several attorneys from Washington, D.C., looking into this matter and are looking into the broader case than just the actual incident that occurred in Wichita,” the official said.

FULL AP STORY FOLLOWS BELOW