Paris: French President Francois Hollande and the US President Barack Obama on Saturday expressed determination to boost common efforts in a bid to combat terrorist cells after suspected followers of the Islamic State killed 14 people in California on Wednesday.
During phone conversation, both leaders affirmed their determination to build strong front to face "common (terrorist) threat" by uniting efforts and resources, Hollande's office said in a statement, Xinhua reported.
Hollande also expressed Paris' "solidarity and emotion" after a couple stormed the Inland Regional Centre social services agency in the city of San Bernardino last Wednesday and killed 14 people, according to media reports.
Three days later, the IS claimed responsibility of the attack in a radio broadcast, they added.
France was the first European country that joined US-led international coalition fighting the IS in Syria and Iraq.