French jets on the tarmac of an undisclosed air base as part of France’s Operation Chammal launched in September 2015 in support of the US-led coalition against Islamic State group.

The defense ministers of France and the United States agreed Sunday on “concrete steps” to intensify cooperation against the Islamic State group, the Pentagon said.

U.S. Defense Secretary Ashton Carter and French Defense Minister Jean-Yves Le Drian discussed by telephone the actions they are taking in response to Friday’s terrorist attacks in Paris that killed at least 129 people.

“They agreed on concrete steps the US and French militaries should take to further intensify our close cooperation in prosecuting a sustained campaign against ISIL,” Pentagon press secretary Peter Cook said.

“Secretary Carter reiterated the firm commitment of the United States to support France and move together to ensure ISIL is dealt a lasting defeat,” he said.

The statement provided no details on the measures to be taken. But U.S. officials said they would build on coordination already being handled by a French two-star general at the US Central Command, which oversees U.S. military operations in the Middle East.

France already takes part in a US-led campaign of air strikes against Islamic State strongholds in Syria and Iraq.

The U.S. deputy national security adviser, Ben Rhodes, said the United States and France also will be intensifying intelligence sharing.

The international response to the attacks was the focus of a summit in Turkey Sunday that includes U.S. President Barack Obama, who vowed that the United States would stand by France and “redouble” efforts against IS.

If France invokes Article V of the NATO treaty, which states that an attack on one member is an attack on all, the United States would “absolutely” support it, Rhodes said on CNN’s State of the Union.

Related articles across the web

• Pentagon Promotes 'Lean In' Groups to Boost Women in Leadership
• Unclear if US-Russia interests overlap in Syria - Pentagon
• Pentagon Seeks More Female And Non-White Leaders Through Facebook Jewess Sheryl Sandberg's Lean In Campaign
• Pentagon Promotes 'Lean In' Groups to Boost Women's Leadership
• Unclear if U.S.-Russia interests overlap in Syria -Pentagon
• Russia launches surveillance drones over Syria
• Watch Live at 2:45 p.m. EDT: Carter, Ukrainian Defense Minister Conduct News Conference
• Obama nominates first openly gay service secretary to lead Army
• Al Qaeda bomb maker killed in Syria: Pentagon
• US and Russian defense chiefs break year-long silence to discuss Syria crisis