Former Labour leader Ed Miliband has cancelled a visit to Luton in the wake of the murder of MP Cox, the Luton News understands.
According to a party source Mr Miliband was due to visit the town today to campaign for Remain.
However all campaigning has been suspended following the murder of Batley and Spen MP Jo Cox.
In a statement Labour leader Jeremy Corbyn said: “Jo died doing her public duty at the heart of our democracy, listening to and representing the people she was elected to serve.
“It is a profoundly important cause for us all.”