Police launched a new counter-terrorism advertising campaign across London this week.

The new campaign calls on members of the public to play a role in preventing terrorist strikes in the capital.

Five different posters will encourage the general public and those working in particular professions to report any suspicious activity.

Three of these posters focus on the rental or sale of accommodation, garage and lock-up facilities and of vehicles.

Another poster encourages retail and bank staff to be aware of fraudulent transactions that may be linked to terrorist fundraising and a fifth focuses on the need for vigilance within the river and marine environment.

Deputy Assistant Commissioner Pete Clarke launched the Met campaign. He said: "Everyone who lives in London, or visits the city for work or pleasure, has a role to play in making it as difficult as we can for terrorists to operate here.

"We can all help by being vigilant and aware of what is happening around us. If it seems suspicious to you, please make that call.

"This publicity campaign is not a response to any specific threat, but I would urge the public to continue to remain alert. We cannot afford to be complacent."

The four-week campaign is intended to encourage people to have the confidence to "trust their instincts" and report any suspicious bags, vehicles or behaviour to the police immediately by dialling 999.

The campaign has been developed in partnership with British Transport Police, City of London Police, Transport for London and the Mayor's Office.

People are also being encouraged to contact the confidential anti-terrorist hotline on 0800 789321 if they have information about possible terrorist-related activity.

A police spokesman said: "Terrorists need places to live and to store equipment and materials.

"They need people to help them and may need transport in order to carry out their plans. They need to raise money, and may use fraudulent transactions to help fund their activities."