BAGHDAD, Iraq (CNN)  -- Iraqis celebrated in the streets Tuesday for the withdrawal of U.S. troops from their cities and towns under an agreement signed last year with the U.S. government. A crowd gathers Tuesday after a deadly bombing in the northern Iraqi city of Kirkuk. But celebration was tempered by fears of renewed violence as insurgents launched new attacks. At least 30 people, including women and children, were killed in what security sources called a "huge bombing" Tuesday in the northern Iraqi city of Kirkuk. Dozens were wounded in the attack in a busy shopping area in a predominantly Kurdish part of the disputed oil-rich city.
@highlight
NEW: Obama: "Iraqis are rightly treating this day as a cause for celebration"
@highlight
Hundreds of Iraqis dance and sing in Baghdad park to mark U.S. pullout
@highlight
Bombing kills at least 30 in northern Iraqi city of Kirkuk, police official says
@highlight
Iraqi woman: "Now that the Americans are leaving, we will be more afraid"
U.S.
U.S.
U.S.
Americans
"The very fact that Iraqis are celebrating this day is a testament to the courage, the capability and commitment of every single @placeholder who has served in Iraq.
U.S.
U.S.
U.S.
Americans
Odierno said the cities would feel "significantly different" without U.S. "battalions," even though there will still be @placeholder in the cities as military trainers and advisers.
BAGHDAD
Baghdad
There were no columns of tanks rolling out of @placeholder or thousands of troops marching out of other cities as the deadline approached.
U.S.
U.S.
U.S.
Americans
While many Iraqis publicly said they are glad to see @placeholder out of their neighborhoods, some were worried about what the future may hold without the U.S. military nearby.
U.S.
U.S.
U.S.
Americans
Four U.S. soldiers serving in Baghdad died Monday of combat-related injuries, the latest of more than 4,300 @placeholder to die there since the U.S-led invasion in 2003.
Iraq
Iraqis
Iraqi
Iraqi
Iraqis
Iraqis
Iraqi
Iraqi
The 130,000 U.S. troops who remain are now tasked with supporting Iraqi troops and police, and will require @placeholder permission to launch operations in the cities.