France has launched its first missions against Islamic State (IS) militants from its Charles de Gaulle aircraft carrier, military sources said.
The newly-deployed carrier has 26 fighters, tripling French capacity.
French President Francois Hollande has vowed to intensify strikes against IS in Syria and Iraq after the group said it was behind deadly attacks in Paris.
Belgian police meanwhile said they had arrested five more people in anti-terrorism raids.
France stepped up its bombings of IS following the attacks on Paris, in which 130 people were killed.
The latest series of strikes launched from the Charles de Gaulle targeted sites in Iraq, the French military said.
On Monday, Mr Hollande met British Prime Minister David Cameron for talks as part of a fresh diplomatic push. He will also meet the leaders of the US, Germany and Russia this week.
Mr Hollande said: “We will intensify our strikes, choosing targets that will do the most damage possible to this army of terrorists.”
The two leaders agreed to step up co-operation on countering international terrorism, including increased data-sharing and sharing of airline records.
Mr Cameron offered his support for Mr Hollande and said it was his “firm conviction” that Britain should also be striking IS in Syria.
Earlier, Mr Hollande and Mr Cameron visited the Bataclan concert hall, where at least 89 people were killed.