Six people have been confirmed dead and many more injured in an attack at London Bridge and Borough Market last night.
Anyone concerned about a loved one can contact the Casualty Bureau on 0800 0961 233.
Facebook's Safety Check has also been activated so people can also mark themselves 'safe' on the social media site to let people know they are OK.
The Facebook page The Attack in London, United Kingdom can be found here.
On the page, you can mark yourself as 'I'm safe' or 'doesn't apply to me'. This allows your Facebook friends to see you are safe.
You can also ask your Facebook friends if they are safe.
Read more: Live updates following terror attack at London Bridge and Borough Market
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