A university boss said students could not be prevented from leaving their accommodation but that they were expected to self-isolate.
The officer was shot by a handcuffed suspect in the early hours of Friday.
Silent tributes have been paid to Sergeant Matt Ratana by members of the rugby club in East Grinstead where he was head coach.
Sgt Ratana is the eighth police officer in the UK to be shot dead in the last 20 years.
Neath Port Talbot, Torfaen and the Vale of Glamorgan will be covered by new restrictions.
Labour has asked the Education Secretary to ‘ensure that every student has access to testing to allow a safe journey home’ for Christmas.
The annual service comes just days after the killing of Metropolitan Police Sergeant Matt Ratana.
Barbara Ralph, 66, will run her 30th London Marathon on October 4.
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