While the bombings in Paris and Brussels are being seen as an attack on Europe as a whole, forging a collective EU response to global terrorism will be very difficult, writes Lucian Kim

Thirteen people have been detained in Belgium and two in France in an anti-terror sweep following a gunfight in which two suspected terrorists were killed.

Amedy Coulibaly, the gunman who killed four hostages at a Paris kosher supermarket, rented a small suburban house the week before the attack and filled it with an arsenal of up-to-date weaponry, police have said.

More than 12,000 foreigners from 74 countries have gone to fight with rebels in Syria, a leading terrorism expert has said.