Campaigners say more clarity is needed over changes to benefits for disabled people.
A new scheme, Personal Independence Payment, is being introduced to replace the Disability Living Allowance. The Government says more people will benefit, but some fear they could lose out.
More top news
A large tent has been put up around the area while investigations continue.
The kind gesture touched the hearts of many who shared and retweeted words of support for the officer on Twitter.
Two workers were forced into a back office as the robbers tried to force their way into a safe, police say.