Police in the Thames Valley are reviewing security measures following Monday's bomb attack, including those for pre-planned events.
Acting Chief Constable John Campbell said: "In light of such tragic events the cooperation of our communities is more important than ever before. I would urge you to contact the police straight away if you believe that someone is acting suspiciously. Trust your instincts and let us decide whether the information is important or not. No piece of information is considered too small or insignificant.
"I would like to reassure you that Thames Valley Police is reviewing our security measures and there is no specific intelligence to suggest a threat to our communities within Oxfordshire, Buckinghamshire and Berkshire. However we all need to remain vigilant.
"My officers and staff will continue to provide a visible presence in our communities and we have specialist resources in place to respond in an emergency."
The confidential Anti-Terrorist Hotline on 0800 789 321 or in an emergency call 999.
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