NEW : Iraqi official says Iranian ambassador to Iraq has been summoned over matter . Iran denies it happened ; Iraqi government blames Iranian ` ` armed . '' Well is in Kurdistan province , east of Amara , near Iranian border , officials say . The two countries had a war that ended in 1988 with parts of border under dispute .
NEW : Iraqi official says Iranian ambassador to Iraq has been summoned over matter . Iran denies Incident happened ; Iraqi government blames Iranian `` armed group '' Well is in Maysan province , east of Amara , near Iranian border , officials say . The two countries fought 8-year war that ended in 1988 with parts of border under dispute .