Attackers sprayed a security checkpoint in Fallujah with gunfire.
Latest eruption of violence rattling the country leaves 30 dead, dozens hurt.
Wedding party guests among 30 killed in Baghdad blasts, extending wave of violence.
Latest violence in a particularly bloody month for the country.
Explosion is latest in a string of attacks in a week of the most sustained sectarian violence since U.S. troops withdrew more than a year ago.
Bloodshed raises fears of a return to the sectarian violence of 2006-07.
Deepens fears Iraq may be headed toward a new round of sectarian conflict.
The attacks come amid growing tensions between the Shiite-led government and minority Sunnis.
A sharp rise in attacks on Sunni holy sites fuels existing sectarian fears in Iraq.
The attacks came a day after nine people were killed in a series of explosions in and around Baghdad.
