Moreover, Barack Obama has offered assistance to Recep Tayyip Erdogan in probing the deadly attack at Istanbul airport, Earnest added.
“The president [Obama] placed that phone call to express his deep condolences on behalf of the American people. In the context of that call he will offer any support that the Turks can benefit from as they conduct this investigation and take steps to further strengthen the security," Earnest said on Wednesday.
On Tuesday evening, three suicide blasts rocked the Istanbul airport international terminal. According to the Turkish Justice Ministry, the attack has left 41 people dead and more than 200 injured.
No terrorist organization has yet officially claimed the attack, but the Turkish authorities have said the Islamic State is the main suspect.
The terrorist group, also known as Daesh, is outlawed in many countries around the world, including the United States and Russia.