Photo from Sky.com shows fire appears to be in the rear of the aircraft. Via NYCAviation.com.

Flights were suspended at London’s Heathrow Airport [LHR] at 16:30 BST due to a fire on an Ethiopian Airlines Boeing 787 Dreamliner. The airport was re-opened at about 18:00 BST today .

The aircraft involved is ET-AOP, which is the first 787 Dreamliner to return to service after the world-wide grounding of the aircraft. No passengers were on board at the time of the fire and officials are trying to determine the cause. Photos show that the fire was in the rear of the aircraft with noticeable damage to the top of the fuselage. Due to the location of the fire, it appears that this is not related to the lithium-ion batteries, which have plagued the Dreamliner.

According to Sky News, the aircraft was parked at a remote stand and was there for more than eight hours before smoke was detected. The plane was scheduled to be used for flight ET701 to Addis Ababa at 9pm.