Regulators said the Dreamliner remained safe to fly but a thorough examination was needed to identify the root cause of the problems including a fire on a parked 787 on Monday.

"There are concerns about recent events involving the Boeing 787. That is why today we are conducting a comprehensive review," Transportation Secretary Ray LaHood told a news conference.

The review will put an emphasis on the 787's advanced electrical systems and cover their design, manufacture and assembly, the Federal Aviation Administration said.