French special forces killed the terrorists behind the Charlie Hebdo massacre at their hideout while a separate siege at a Kosher supermarket saw a gunman killed and four hostages dead.

The Kouachi brothers massacred 12 people at the Charlie Hebdo office on Jan.7, including two policemen and the magazine's cartoonists.

They were hiding in a printing firm in northern France, 40km from Paris, with a hostage they had taken captive. The hostage was freed after a shootout.

Before the stand-off, police exchanged fire with the pair in a high-speed car chase after they hijacked a car.

Around the same time, a third hostage-taker, who was apparently in the same Al-Qaeda group as the Kouachi brothers, took several hostages in a Kosher supermarket in eastern Paris. The 32-year-old gunman, whose name was Amedy Coulibaly, was killed and is said to know at least one of the brothers.

Four hostages were killed at the supermarket, bringing the number of people killed in the last three days to 17.

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Screenshot from France 2.