A spokesman for DSEI said:
We recognise and respect the right to protest and we plan for these scenarios in advance....While the police monitor and manage protests, it is DSEI's function to go ahead with organising and carrying out a highly regulated event, complying with international laws and treaties.
We are delighted that this year's event encompasses a full range of defence and security equipment, including that which is designed to tackle humanitarian disasters, address food shortages and mass displacement of people, counter terrorism measures and cyber security.
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An eyewitness said: "It was very unnerving. It was just after 12pm and there were suddenly police vans and cars everywhere."