Baghdad, Iraq (CNN) - U.S. Vice President Joseph Biden has left Iraq, concluding a two-day unannounced visit to the war-torn nation, embassy officials said.
Biden and his wife, Jill, arrived in Baghdad on Saturday to celebrate the Fourth of July with U.S soldiers serving in Iraq.
In her official blog, Jill Biden said one event she and her husband participated in was to join 150 soldiers as they took an oath of citizenship during a naturalization ceremony.
Separately, an Iraqi Interior Ministry official told CNN that two mortar rounds landed in the International/Green Zone early evening Monday, a day after three rounds struck the protected area. U.S. officials could not confirm Monday's attack.