LIVE United Airlines #UA53 is declaring an emergency after takeoff from Zurich, now holding

United Airlines flight #UA53 to Washington declared an emergency 30 mins after takeoff from Zurich. UPDATE 12:08 UTC United #UA53 safely landed runway 16 at Zurich after reporting pressurization issue. UPDATE 11:53 UTC United #UA53 is holding near Zurich before landing runway 16 after pressurization issue. UPDATE 11:18 UTC United #UA53 burn fuel is complete, will return to Zurich…