Gunmen killed one person and injured three police officers during a free speech debate in Copenhagen attended by a controversial Swedish cartoonist, officials said.
The French ambassador was also present at the debate.
Reports say up to 40 shots were fired during the attack and a manhunt has been launched.
Swedish cartoonist Lars Vilks has faced death threats after drawing caricatures of the Prophet Muhammad.
He was not harmed during the attack.
Shortly after the shooting, a message appeared on the Twitter feed of French ambassador Francois Zimeray saying he was still alive.
These are the Vilks’ pictures, which I won’t be bullied, threatened or harassed not to show:
It won’t take long for some people to start making excuses like the “this had nothing to do with Islam” cop-out?
And terrorism apologists —such as the Pope— will tell us how Lars Vilks had it coming.