There is understood to be a 100m cordon in place around Grand Arcade in Cambridge following reports of a suspicious package.
Bomb disposal teams have been dispatched, police are expected to be in the area for several hours.
More top news
Four golden Labrador puppies that were dumped over a garden fence in Essex have been rescued by the RSPCA.
2017 will be the year that Britain triggers its exit from the EU and Anglia Late Edition looks at how that will affect the East of England.
A joint investigation will be carried out between the Police and the Maritime and Coastguard agency.