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Kent Police has issued guidance on how to spot a potential terrorist and how to know when someone is being radicalised - as the nation faces a severe threat of a terror attack.
The advice highlights ways to spot when someone is behaving strangely, and what to do if you fear someone near you is a potential terrorist.
129 people were killed and hundreds injured in a series of assaults on the French capital last Friday.
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The general guidance, which has been on Kent Police's website since 2005, urges people to be vigilant, saying: "Terrorists have to live somewhere. They will need a place to keep things, as well as vehicles and people to help them.
"They may come and go at strange times of day and night. They may make unusual financial transactions. Someone you know may start to behave differently."
The advice tells neighbours to watch out for "factors that can leave someone more susceptible to exploitation by violent extremists."
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These include personal crisis, for example divorce or estrangement from their family, a change in circumstances and links to crime.
They also highlight being under-employed as a risk - where the job a person has doesn't reflect an individual's skills or experience.
The Kent Police advice particularly calls on those who see anything around the coastline, ports and waterways to be extra vigilant.
Those living near airfields are asked: "Heard or seen anything unusual in or around airfields? Report it. Even the smallest thing can be significant."
Schools can also be breeding grounds for extremism, it warns.
The advice says: "It is very rare for school children to become involved in criminal extremist activity but young people can be exposed to extremism or prejudiced views. This can be from the internet from an early age."
Even the most ordinary household objects can be dangerous in the wrong hands, they warn.
Gardeners and farmers are advised to secure their fertiliser. Terrorist groups have used fertiliser to make explosive devices for many years. Even in small quantities, some fertilisers can cause destruction.
The police guidance adds: "The terrorist threat remains real and there is no room for complacency. You should remain alert and aware of your surroundings at all time."
Services and silences have been held across the county to remember those who lost their lives in the terrorist attack.
Anyone who sees someone acting suspiciously, or a vehicle out of place or perhaps an unattended package or bag should report it.
Witnesses should move away and call 999.
If they see something that strikes them as suspicious and out of place, people are urged to trust their instincts and call the police on 999 or the anti-terrorist hotline on 0800 789321.
For more information, visit this link.