Warsaw, Poland, Aug 18, SPA -- Two mortar rounds were fired at a Polish base in central Iraq, but they missed their targetand caused no injuries, a military spokesman saidWednesday. One round exploded outside the base in Karbala Tuesdaynight, while the other failed to detonate and was beingdefused by Iraqi police, Polish Maj. Krzysztof Plazuk saidby telephone from Iraq.--SPA1157 Local Time 0857 GMT www.spa.gov.sa/192935