French police have launched a huge search for the three gunmen who shot dead 12 people at the Paris office of the French satirical magazine Charlie Hebdo.

Two suspects in Wednesday's attack are still on the loose after escaping onto the streets of Paris, says the police. 

The police appealed to the public for information about the two suspects who are brothers aged 34 and 32 years old and named as Said and Cherif Kouachi.

Citing sources, the Agence France Presse news agency reported that an 18-year-old suspect in the attack had surrendered to police.

This combo shows handout photos released by French Police in Paris early on January 8, 2015 of suspects Cherif Kouachi (L), aged 32, and his brother Said Kouachi (R), aged 34. They are wanted in connection with an attack at a satirical weekly in the French capital that killed at least 12. [Xinhua photo]