French police on Thursday published photos of two brothers wanted as suspects over a bloody massacre at a magazine in Paris as they launched an appeal to the public for information.

Paris police said arrest warrants had been issued for Cherif Kouachi, 32 and his 34-year-old brother Said who were "likely armed and dangerous".

An 18-year-old implicated alongside two brothers in the bloody attack against a satirical weekly in Paris has surrendered to police, according to a source close to the case.

"Hamyd Mourad handed himself in to police... on Wednesday at 11:00 pm (2200 GMT) after seeing his name circulating on social media," the source told AFP.

"He has been arrested and taken into custody," another source confirmed.