Police in Iraq say gunmen killed two Christian brothers on Monday in the northern city of Mosul.
    
Saad and Raad Hannah were working in their auto mechanic shop when the attackers burst in and shot them. It was the latest in a spate of attacks targeting nation's Christian minority.
    
Violence against believers has increased in the last month, including an insurgent assault on a Catholic church in Baghdad that left 68 people dead.

According to the U.S. Commission on International Religious Freedom, Iraq's Christian population has dwindled from 1.4 million in 2003, to 500,000.

The commission said Christian leaders are warning the decline could signal "the end of Christianity in Iraq."