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How do terrorism threat levels work?

Bomb-making and explosives guides found on phone

Venue staff counter-terror trained ahead of new law

Army reject guilty of having bomb-making manuals

Far-right extremist jailed after Lakes tunnel plan

Prevent counter-terror scheme lambasted in review

A third of terrorism scheme reports about children

Far-right extremists getting 'dangerously' young. Video, 00:02:30Far-right extremists getting 'dangerously' young

Alarming rise in teen far-right extremism - police

Man accused of keeping 3D-printed gun instructions

Uranium in cargo sparked alert at Heathrow Airport

Two arrested on suspicion of terror offences

PM urged not to delay venue security bill

Terrorists face longer sentences over prison crime

Iran organised 10 kidnap and death plots, MI5 says

Anti-terror bollards to return to city centre

Police take to rooftops and manholes for funeral security

Met's new commissioner 'tougher than he looks'

Two charged after right-wing extremism probe

April date for city to get anti-terror bollards

Weapons hoarder jailed again over court breach

'Bring me his head' - the spy sent to get Bin Laden

Was al-Qaeda leader killed by bladed missile?