France's parliament was set to vote on extending its military operations in Iraq as part of the U.S.-led coalition against ISIS.
The threat, aimed at France, comes a day before Charlie Hebdo is set to publish its latest issue, featuring the Prophet Muhammad.
Bulgarian police arrested Fritz-Joly Joachin, 29, Jan. 1 at a border checkpoint when he tried to cross into Turkey.
Defense Minister Jean-Yves Le Drian said 10,000 troops and 5,000 extra police officers would be in place by Tuesday night.
The feeling of solidarity against terrorism may be short-lived as fear of backlash grows.
A lawyer and columnist for the magazine said the new cartoons are meant to show that it will “cede nothing” to extremists.
A Fox News commentator who called the U.K.'s second-largest city "totally Muslim" has apologized.
Several world leaders marched together, in Paris, in a show of solidarity against terrorism.
"I call on all the French people to rise up this Sunday ... to defend the values of democracy, freedom and pluralism," Francois Hollande says.
Nobody was injured in the attack on the Hamburger Morgenpost, and it is unclear whether it was connected to its reprinting of the cartoons.
Hezbollah's leader says hard-line Sunni groups caused more damage than people who drew cartoons mocking Islam's Prophet Muhammad.
The loosely organized hacking group says it will target the social media accounts of “terrorists.”
The Yemen branch of al Qaeda claimed responsibility for the attack at weekly satirical magazine Charlie Hebdo in Paris on Wednesday.
The shootings in Paris highlight that terrorists now go for "soft" targets, but terror has always been opportunistic.
In wake of the Charlie Hebdo attack, Islamic academics explain the role satire plays in European Muslim communities.
Jyllands-Posten had published 12 cartoons, most of them related to the Prophet Muhammad, in September 2005, triggering violent protests.
Raif Badawi, founder of the website "Free Saudi Liberals," will be flogged every Friday for 20 weeks until the completion of his sentence.
The decision to send the US attorney general comes even as countries across Europe have beefed up security to prevent further attacks.
Depicting the prophet in images and illustrations is not traditionally blasphemous in Islam, but disrespect is.
Bill Donohue, president of the Catholic League, said the murder of 12 people at the Paris magazine was provoked by religious intolerance.
Three suspects in the Charlie Hebdo shooting were identified Wednesday night after 12 people were killed in Paris.
Countries such as Kenya are among the most dangerous places to be Christian, according to the World Watch List.