NTSB says has not found root cause of Boeing 787 battery fire

March 7 Thu Mar 7, 2013 11:25am EST

March 7 (Reuters) - The National Transportation Safety Board is examining the certification and testing of the lithium-ion battery system on the Boeing Co 787, the NTSB said on Thursday.

The NTSB's "interim factual report" on a January battery fire in Boston did not include any conclusions about the cause of the fire, which contributed to the plane's grounding by regulators.