BBC News - Heathrow emergency landing: Engine doors 'left unlatched'

The doors on both engines of the flight that made an
emergency landing at Heathrow last week had been left
unlatched, investigators have found.
Air accident experts said the coverings - the fan cowl doors
- separated and punctured the right engine's fuel pipe,
damaging the aircraft's systems.

http://m.bbc.co.uk/news/uk-england-london-22732582