An official vehicle carrying Japan's acting ambassador to Iraq was hit by a bullet in Baghdad, but there no one was injured, the Foreign Ministry said Friday.

The bullet cracked the windshield of the car of Satoshi Ashiki, temporary charge d'affaires, near the Japanese Embassy Thursday afternoon, the ministry said in a statement.

It was not immediately clear whether the bullet was specifically aimed at the diplomat.

Ministry official Kimitake Nakamura, citing witness accounts, said a convoy behind Ashiki's car fired warning shots at a vehicle that was between them and the Japanese car.

"Judging from the circumstances when the bullet hit the car, it is unlikely that it was a terrorist attack aimed at us," Nakamura said.