Four Iraqi soldiers were wounded Sunday in a rocket attack targeting an air base just north of Baghdad where American trainers are present, security officials said. 

The Iraqi military said in a statement that eight Katyusha rockets had been fired at the site, about 50 miles north of the capital Baghdad, and that two of the wounded included officers.  
Military sources identified the wounded as Iraqi soldiers. They said seven mortar bombs had hit Balad air base’s runway. 
There was no word of any US casualties among the forces at the site but the incident came just days after another rocket landed nearby.