Three mortar rounds Tuesday morning apparently hit several dozen meters northwest of the Japanese camp in the southern Iraqi city of Samawah, the Defense Agency said.
No injuries were reported.
The agency said the apparent attack, which took place at 2 a.m. local time, was the closest to the camp since about 550 Ground Self-Defense Force troops were sent there on an aid mission beginning in February. No mortar round traces were found inside the camp, it said.
Samawah police confirmed three mortar rounds had been fired, and in conflicting information, said they received reports that an unknown number of rounds landed inside the GSDF compound.
Dutch forces, who are in charge of maintaining security in the area, are working to determine where the rounds hit and what type they were.