An Iranian father and son convicted of a plot to smuggle high-tech missile parts from the United States were part of a worldwide effort by Iran to obtain U.S. weapons during the Persian Gulf war, an official says.

Ahmad Modarressi, 64, and his son, Majid, 30, each face up to 15 years in prison and $1.25 million in fines for their attempt to send microwave tubes for the Hawk anti-aircraft missile system to Tehran.The father pleaded guilty last week, and the son was found guilty Wednesday after a four-week jury trial in U.S. District Court.