Paris shootings: 'Journalists are martyrs for liberty', says Kerry

Ten journalists who lost their lives during a gun attack in Paris are "martyrs for liberty", the US Secretary of State has said.

John Kerry was speaking following the massacre at the offices of satirical magazine Charlie Hebdo, believed to have been carried out by Islamic militants.

The weekly publication had courted controversy in the past with its irreverent take on news and current affairs.

Mr Kerry said: "Free expression and a free press are core values... principals that can be attacked but never eradicated."