Insurgent bombers strike in Mosul, Baghdad; 13 killed, dozens wounded

BAGHDAD — Suicide car bombers struck twice Sunday in the northern city of Mosul, killing at least six people and wounding dozens of others.

Meanwhile, a car bomb killed seven other people in Baghdad and two Iraqi soldiers were killed by snipers in separate attacks in the capital's Yarmouk district.

Also Sunday, the government announced new security measures to protect Christians in Mosul after a spate of attacks against them by Sunni religious extremists.

The latest violence shows the ongoing security challenges facing Iraq as the U.S. shifts responsibility to the Iraqi military and police after a sharp decline in insurgent attacks this year.