NPR:

FBI agents on Tuesday raided the offices of Special Counsel Scott J. Bloch, who oversees protection for federal whistleblowers. The agents seized computers and shut down email service as part of an obstruction of justice probe, NPR has exclusively learned.

FBI agents also searched Bloch's home and a Special Counsel field office in Dallas. A grand jury in Washington issued subpoenas for several OSC employees, including Bloch, according to NPR sources who spoke on condition their names not be used.

Bloch, who has also been under investigation for allegedly retaliating against career employees and obstructing an investigation, was being questioned at his Washington, D.C. office on Tuesday morning, according to the NPR sources.