Terror threat reminder campaign
Police have launched a counter-terrorism publicity campaign to remind people that the threat to the UK remains real and serious.
The two-week initiative, featuring a 40-second radio advert to be broadcast across England and Wales, has the message: "If you suspect it, report it."
A Metropolitan Police Service (MPS) spokesman said: "Everyone has a role to play in fighting terrorism and the public are being encouraged to contact the confidential Anti-Terrorist Hotline on 0800 789 321 if they see any activity or behaviour they think is suspicious."
He added: "The threat to the UK from terrorism remains real and serious and public vigilance and awareness is crucial in helping to create a hostile environment for terrorists.
"The advert recognises that some people may be reluctant to report suspicious activity or behaviour, such as a person taking an unusual interest in security arrangements, because 'Chances are, it's probably nothing'. But it goes on to encourage people to think 'But what if it isn't'?"
Assistant Commissioner John Yates, head of MPS Specialist Operations and chair of the Association of Chief Police Officers, Terrorism and Allied Matters, said: "Recent events at East Midlands Airport and continued speculation about 'Mumbai-style' attacks serve as a stark reminder of the real and enduring threat we continue to face from terrorist groups.
"These groups are constantly looking at new and inventive ways to launch attacks on the UK and our citizens.
"We all know that the threats against us continue to diversify - from Al Qaeda-led and inspired groups, through Irish-related terrorism to right wing extremists.The police and security services need the help of the public to protect the country from the threat of terrorism. We cannot do it alone.
"We all have a responsibility to remain vigilant and aware and to report any suspicious activity. We must not become complacent."
Police urged people to look out for the unusual - some activity or behaviour which struck them as not quite right and out of place in their day to day lives.