Doctor John Sentamu inside a church where he has recorded three special video messages for the Easter weekend.
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Members of the University and College Union (UCU) said support was "solid" on the first day of the biggest ever wave of strikes.
Hundreds of workers have been evacuated and an officer at the cordon says it could be several hours before they are allowed to return.
Thrush Hour: A pair of Mistle thrushes raise an early brood on a traffic light at a busy Leeds junction