( CNN ) -- NEW : At least seven people have been killed and dozens wounded in shelling , medical officials say . NEW : Al Qaeda - linked groups warn Sunnis to stop working with the government . Iraq : ` ` There will be no withdrawal , '' Prime Minister Ali al - Maliki says .
NEW : At least seven people have been killed and dozens wounded in shelling , medical officials say . NEW : Al Qaeda - linked groups warn Sunnis to stop working with the government . Iraq : ` ` There will be no withdrawal , '' Prime Minister Ali al - Maliki says .