Records withheld by the U.S. Chemical Safety and Hazard Investigations Board have stalled an investigation by the Environmental Protection Agency’s internal watchdog group, according to a letter written by Inspector General Arthur A. Elkins Jr. on Sept. 5 and released Tuesday.

The IG sent what is known as a “seven day letter” following CSB’s Aug. 8 refusal to provide documents to the IG in part of a law enforcement investigation. The documents requested were emails between “high level CSB officials” and outside legal counsel.

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