Alexanda Kotey was part of terror group cell of four Britons known for its extreme brutality

Teenager attributed early display of remorselessness to threats she faced from extremists in al-Hawl

Furore over home secretary's failure to seek assurances pair would not be executed

Alexanda Kotey and El Shafee Elsheikh detained by Syrian Kurdish fighters

Muhiddin Mire (30), attacked 56-year-old musician Lyle Zimmerman with rusty knife

British citizen Mohammed Emwazi gained notoriety for filmed execution of hostages

Video appears to show the killing of five men who Isis claims were spying for Britain

Turkey is focused on detecting Islamic State fighters crossing its border

Corbyn move to allow free vote on air strikes exposes divisions, writes Denis Staunton

The man suspected of planning the Paris attacks is a well-known face of Islamic State

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Prepare, protect, pursue, prevent - the four Ps of the UK’s ‘Contest’ strategy

Killing of the British citizen called a ‘barbaric murderer’ has been broadly welcomed

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Death of UK terrorist believed responsible for gruesome beheadings not yet confirmed

21-year-old was deported to Birmingham after trying to cross illegally into Syria