Flight CX811 departed Boston Airport at 02:04 EST to Hong Kong. The Airbus A350K (registration-LXM) stopped the climb at 5,000 ft right after takeoff.

The crew declared an emergency (squawk 7700) 30 minutes after departure from Boston Logan International Airport due to smoke in the cabin.

UPDATE 1
The flight is now holding over Massachusetts Bay to dump fuel before returning to BOS Airport.

UPDATE 2
The A350K now descended to 4,200 ft prior to final approach.

UPDATE 3
The crew contacted ATC about smoke in the cabin.

UPDATE 4
Flight CX811 just landed back on runway 33L, a bit more one hour after departure.

UPDATE 5
The aircraft vacated the runway and stopped on the taxiway, met by emergency vehicles.

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