The U.S. embassy said Wednesday that a blast at Baghdad airport late the previous night was an attack on a U.S. diplomatic compound that caused no casualties. 

The attack came just hours before Iran's new President, Masoud Pezeshkian, flew in for a three-day visit, his first foreign trip since taking office in July. 

"There was an attack at the Baghdad Diplomatic Services Compound, a U.S. diplomatic facility," the embassy said in a statement. "Fortunately, there are no reported casualties, and we are assessing the damage and its cause." 

Iraq's Joint Operations Command had earlier reported an explosion inside an area of the airport occupied by international coalition advisers. "Iraqi security forces were unable ... to determine the origin of the explosion, which has not been claimed," the command's spokesperson, Major General Tahseen Al Khafaji, said in a statement.