Ahmed Abassi allegedly met Chiheb Esseghaier and attempted to radicalise him, New York prosecutors said.

BBC: Tunisian held in New York over Canada train bomb plot

Mr Blair's authority was massive at the time, and he could have used it to radicalise the party's programme.

ECONOMIST: Bagehot

But he was slow to radicalise, and cautious even as his radicalism grew.

ECONOMIST: Liang Congjie

They fear a bust-up will radicalise their already-turbulent southern and eastern neighbourhoods.

ECONOMIST: Charlemagne

The left-wing opposition, the Broad Front, already looking ahead to a presidential election due in 2004, reckons (wrongly, thinks Mr Garce) that its best tactic is to radicalise.

ECONOMIST: Uruguay's economy

"Some people may be talking in a way that might radicalise some Muslims but we categorically condemn this, " says Semsettin Ugurlu, the president of the Muslim Executive in Belgium.

BBC: From Belgian school to Syrian battleground