The Airbus A330-200 of Gulf Air flight #GF3 from Bahrain to London Heathrow declared an emergency.
The aircraft descended rapidly from 40,000ft to 8,000ft over Belgium due to a cabin pressurisation issue.
The oxygen masks then dropped to the 89 passengers before a safe landing at Heathrow.
LIVE: Gulf Air #GF3 has declared an emergency inbound to Heathrow pic.twitter.com/jySAzVuEsA – @NikPhillips666
— AirLive.net (@airlivenet) December 13, 2015