\"This is a terrorist operation against an office that has been threatened several times, which is why it was protected,\" he said, without going into the specifics of the police protection at the office in the center of Paris. Photos from the scene show a police car riddled with bullet holes.

The newspaper had been targeted in the past over its content, often aimed at religious groups.

French officials confirmed that there are believed to be three attackers, all of whom were seen in videos wearing black from head-to-toe. Their identities and affiliations have not been revealed but one of the men is heard screaming \"Allahu Akbar,\" an Islamic phrase meaning \"God is great,\" in one of the scene videos.

\"PHOTO:
Remy De La Mauviniere/AP Photo
PHOTO: People stand outside the French satirical newspaper Charlie Hebdo's office after a shooting, in Paris, Jan. 7, 2015.
>
\"PHOTO:
ABC News
PHOTO: Authorities in France are investigating a shooting, Jan. 7, 2015.
>

This morning's turmoil punctured an otherwise normal day in the French capital, with the gunshots audible from nearby buildings, sending bystanders cowering. The masked gunmen were later seen fleeing the scene and hijacked a car, authorities said. They have not been caught and a search is underway for the shooters.

The tragedy marks France's deadliest terror attack in decades. The government raised its terror alert to the highest level and reinforced security at houses of worship, stores, media offices and transportation.

The New York City Police Department ordered extra security to the French consulate in Manhattan and the U.S. Department of Homeland Security said that they are closely monitoring the events in France and are ready to adjust their \"security posture, as appropriate.\"

Un homme évacué devant les journalistes #CharlieHebdo pic.twitter.com/ZDlt0hImTK

— Mathieu Magnaudeix (@mathieu_m) January 7, 2015

Charlie Hebdo, a satirical newspaper, has come under attack before. Their office was firebombed in 2011 and its website was hacked after its cover featured the prophet Muhammad. Nearly a year later, the publication again published crude Muhammad caricatures, drawing denunciations from around the Muslim world.

The cover of this week's issue of the newspaper focuses on a new book by Michel Houellebecq, “Submission,” which depicts France led by an Islamic party that bans women from the workplace.

\"PHOTO:
Jacky Naegelen/Reuters
PHOTO: A bullet's impact is seen on a window at the scene after a shooting at the Paris offices of Charlie Hebdo, a satirical newspaper, Jan. 7, 2015.
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\"PHOTO:
STR/AFP/Getty Images
PHOTO: A police car riddled with bullets during an attack on the offices of the newspaper Charlie Hebdo in Paris, Jan. 7, 2015.
>

President Obama condemned the \"outrageous\" attack.

\"France is America’s oldest ally, and has stood shoulder to shoulder with the United States in the fight against terrorists who threaten our shared security and the world,\" President Obama's statement read. \"Time and again, the French people have stood up for the universal values that generations of our people have defended.\"

Canadian Prime Minister Stephen Harper expressed sadness following the shooting.

I’m horrified by the barbaric attacks in France. Our thoughts and prayers are with the victims and their families.

— Stephen Harper (@pmharper) January 7, 2015

Get real-time updates as this story unfolds. To start, just \"star\" this story in ABC News' phone app. Download ABC News for iPhone here or ABC News for Android here.

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