US Secretary of State John Kerry said on Monday that the United States would stand "side by side" with France in decisiveness to defeat the Islamic state assuming responsibility for the terrorist attacks that killed 129 people in Paris.

Kerry talked after arriving in Paris to pay homage to the bloodthirsty victims at several restaurants, cafes, concert halls and the soccer stadium that were targets of militants attack on Friday night. You should meet with French President Francois Hollande on Tuesday morning.

After flying from Turkey where he attended G20 group meetings, Kerry immediately went to the American Embassy in the center of Paris and pressed the switch to illuminate the facade of the building in the blue, white and red flag of the French flag.

"No one should doubt that the light is still shining in the City of Light," he said. "Paris knew the darker moments and overwhelmed them."

Kerry spoke of France as the eldest American ally and said that the United States would stand "side by side" with it in the struggle against the Islamic state.

"Tonight we are all Parisians," he said. "In the end we will defeat Daesh and all who share their subtle ideology," Kerry said calling the Islamic State its Arabic abbreviation.

On Sunday, the Pentagon said the United States and France agreed on concrete steps to boost the fight against the Islamic state in telephone conversation between US Defense Minister Ash Carter and French Defense Minister Jean-Yves Le Drian.