A TERRORIST incident took place at London Bridge on November 29, 2019 just weeks after the UK's terror threat was downgraded.

But what do the levels mean and why do they change? Here's everything we know...

3 Cops at the scene of the 2019 London Bridge attack

What is the current UK terror threat level?

The current threat level is unclear following a terror attack on November 29.

Just weeks before the incident on November 4, the UK's terror threat level had been downgraded from "severe" to "substantial."

The Met Police have issued a statement saying that more cops will be on the streets following the terrorist incident and the UK's threat level is expected to change soon.

3 Medical services at the scene of an incident at London Bridge on November 29, 2019

What happened at London Bridge on November 29?

A suspected "Islamic" terrorist wearing a fake suicide vest was shot dead by cops after attacking up to 12 people with a knife at London Bridge.

Two people attacked by the unnamed man have died.

Terrifying footage showed the suspect was shot dead twice at the scene after hero bystanders wrestled him to the ground.

Met Police Assistant Commissioner Neil Basu confirmed a number of people had been injured in the stabbing attack this afternoon.

Assistant Commissioner Basu said: "We believe a device was strapped to the body of the suspect was a hoax device."

He said that while authorities were keeping an "open mind", the attack had been declared a terrorist incident.

You can keep up with updates from the scene here.

3 Brave Londoners stepped in to disarm the knifeman

What do the threat levels mean?

Threat levels are designed to give a broad indication of the likelihood of a terrorist attack.

LOW means an attack is unlikely.

means an attack is unlikely. MODERATE means an attack is possible, but not likely

means an attack is possible, but not likely SUBSTANTIAL means an attack is a strong possibility

means an attack is a strong possibility SEVERE means an attack is highly likely

means an attack is highly likely CRITICAL means an attack is expected imminently

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What should you do if you have info on a terror attack?

Members of the public should always remain alert to the danger of terrorism and report any suspicious activity to the police on 999 or the anti-terrorist hotline: 0800 789 321.

If your information does not relate to an imminent threat, you can also contact MI5.