All Nippon Airways has grounded its fleet of 17 Boeing 787s after an aircraft made an emergency landing following a suspected battery problem.

The incident, which comes hard on the heels of a battery fire in a Japan Airlines (JAL) 787 on the ground at Boston Logan International Airport on Jan. 7, occurred during an ANA flight from Tokyo’s Haneda airport to Yamaguchi in western Japan on Jan. 15. The aircraft, carrying 129 passengers and eight crew, diverted to Takamatsu after smoke was reportedly detected in the flight deck.

Details of the incident, and of reports of a battery malfunction being detected on the engine indication and crew alerting system (EICAS), remain unconfirmed. Boeing says that it is “working with our customer” but is not offering additional comment at this time.

ANA says the fleet is being grounded for inspections, and expects to update the situation within the next few hours. JAL is also reportedly suspending its 787 flights.

Japanese investigators and representatives of the Japan-based battery manufacturer, GS Yuasa, have joined the NTSB-led investigation into last week’s battery fire at Boston. The lithium-ion batteries, of which the 787 has two, are part of the Thales-supplied electrical power conversion system, and are the focus for the investigation.