Sunni Arabs are ready to end their boycott of talks to form a new government if rival Shiites return mosques seized in last week’s sectarian attacks and meet other unspecified demands, a Sunni official said today.

In the deadliest single strike since the fall of Saddam Hussein, a suicide car bomber attacked mostly Shiite police and National Guard recruits lined up for physical exams at a medical clinic, killing 115 and wounding 132 there and at a nearby market.