A Delta 767 narrowly escaped a catastrophe in Zurich last Friday. The Boeing 767 taxied for runway sixteen when someone in the control tower noticed that something was coming out of the right engine. The control tower then notified the pilot who found nothing uncommon. The aircraft was now on the runway when the tower ordered evacuation and the firefighters had foamed the runway. A big fuel leak in the engine was the cause. If the aircraft had taken off it would have exploded into a fireball.
This was a close call.