BAGHDAD: Violence in Iraq, including the shelling of a militant-held city, a suicide bombing and shootings, killed 20 people on Saturday as officials tallied votes from last month’s parliamentary election.

The bloodshed is part of the worst protracted surge in unrest since a brutal Sunni-Shiite sectarian war killed tens of thousands in 2006 and 2007, sparking fears Iraq may be slipping back into all-out conflict.

Shelling in Fallujah, which has been held by anti-government fighters for more than four months, killed 11 people and wounded 20, according to Dr. Ahmed Shami of the city’s main hospital.

The source of the fire was not immediately clear.

The casualties come a day after Iraqi forces launched an operation to retake areas near Fallujah, which lies just a short drive west of Baghdad, in preparation for an eventual assault.

Security forces claimed to have killed 50 militants in a series of operations around Fallujah Saturday, according to Interior Ministry spokesman Brig. Gen. Saad Maan, who added that they had also destroyed several insurgent hideouts.

For months, the authorities have trumpeted wide-ranging anti-militant operations, insisting they are making an impact, and have been quick to blame external factors such as the civil war in neighboring Syria for the rise in bloodshed.

But analysts and diplomats say the Shiite-led government must also do more to reach out to the disaffected Sunni minority in order to undermine support for militancy.