Paris, Jan 8 (IANS): The youngest of the three suspects in the attack on Charlie Hebdo, a satirical magazine here, has surrendered voluntarily, a media report said.

The 18-year-old suspect may have helped two other suspects to escape, Xinhua quoted police as saying. He surrendered "around 23.00 hours after seeing his name on social media", media reports citing a police source said.

Another source also confirmed that "he was arrested and put in custody".

On Wednesday, Hooded gunmen dressed in black burst into the office of the magazine, killing 12 people in a coordinated strike. The attackers then fled the spot.

The three suspects were later identified and named in a police document circulated to regional forces as Hamyd Mourad, 18, and brothers Said Kouachi, 32 and Cherif Kouachi, 34.

"Two of them are brothers," said Paris Deputy Mayor Patrick Klugman.

Eight journalists, including the magazine's editor, and two policemen were among the dead.