WASHINGTON – The government stepped in Friday to assure the public that Boeing’s new 787 Dreamliner is safe to fly, even as it launched a comprehensive review to find out what caused a fire, a fuel leak and other worrisome incidents this week.

Despite the incidents, Transportation Secretary Ray LaHood declared, “I believe this plane is safe, and I would have absolutely no reservations about boarding one of these planes and taking a flight.” Administrator Michael Huerta of the Federal Aviation Administration said his agency has seen no data suggesting the plane isn’t safe but wanted the review to find out why safety-related incidents were occurring.

The 787 is the aircraft maker’s newest and most technologically advanced airliner, and the company is counting heavily on its success. It relies more than any other modern airliner on electrical signals to help power nearly everything the plane does.

A fire ignited Monday in the battery pack of an auxiliary power unit of a Japan Airlines 787 empty of passengers as the plane sat on the tarmac at Boston’s Logan International Airport. Also this week, a fuel leak delayed a flight from Boston to Tokyo of another Japan Airlines 787.

On Friday, Japan’s All Nippon Airways reported two new problems. In one, a very small amount of oil was discovered leaking from an engine of a 787; the jet returned to Miyazaki, and after checks found no safety risk it flew to Tokyo.

On another flight, to Matsuyama on the island of Shikoku, glass in a cockpit window cracked, and the aircraft was grounded for repairs. ANA said it has no specific plan for inspections and will continue regular operations.