A shooting rampage by an Islamic State supporter in Vienna that killed four people is the latest in a spate of such atrocities in Europe. A recap of the deadliest attacks since 2015.
The terrorist threat against Europe has mutated in the last half-decade as jihadist groups have seen their Middle East sanctuaries eroded, but analysts say the West must remain braced for more attacks
The imminent fall of the Islamic State's caliphate in Iraq and Syria has left many countries grappling with what to do with jihadists who want to return.
EU ministers raise concerns about whether citizens' rights are protected in a bill aimed at speeding up investigators' access to email and other digital evidence.
As France honored a policeman killed in the latest attack by a homegrown jihadist, debate has again flared over how to counter the influence of radical Salafist interpretations of Islam.