A screengrab of a video showing part of the attack. Screenshot/Twitter/@Charles_Lister A manhunt is underway in France after a shooting at the headquarters of the satirical newspaper Charlie Hebdo on Wednesday.

The shooting left 12 people dead including several members of the magazine's staff.

French law enforcement identified the three suspects on Wednesday afternoon. The Associated Press reports that two of the suspects are reportedly brothers in their early 30s, and the third is 18-year-old.

ABC News Correspondent Alexander Marquardt, citing French police, reports that the 18-year-old suspect has turned himself into police while the two brothers are at large.

AP notes that one of the brothers, Cherif Kouachi, "was convicted in 2008 of terrorism charges for helping funnel fighters to Iraq's insurgency, and sentenced to 18 months in prison. During his 2008 trial, he told the court he was motivated by his outrage at television images of torture of Iraqi inmates at the U.S. prison at Abu Ghraib."

The French Magazine Le Point reported that French police described the two remaining suspects as "French-Algerian." According to Le Point, the two men returned to France from Syria last summer.

Counterterrorism experts said that the attackers looked professionally trained in some capacity.

The New York Times reports that the Paris prosecutor, François Molins, "said that two men armed with AK-47 rifles and wearing black hoods, had forced their way into the weekly’s offices about 11:30 a.m., firing at people in the lobby, before making their way to the newsroom on the second floor, interrupting a news meeting and firing at the assembled journalists.

The attackers then fled outside, where they clashed three times with the police, shooting one officer as he lay on the ground on a nearby street. They then fled in a black Citroën, and headed north on the right bank of Paris. During their escape, prosecutors said, they crashed into another car and injured its female driver, before robbing and abducting a bystander."

Charlie Hebdo drew the ire of Islamic militant groups for regularly publishing cartoons and articles that lampooned jihadists including caricatures of the prophet Muhammad, which many Muslims find offensive. The magazine's offices were firebombed in 2011.

AFP reports that an anti-terror operation took place in Reims, a city in northeast France. Reuters reports that one of the suspected shooters is from Reims.

Additional reporting by Pierre Bienaimé and Peter Jacobs.