Gunmen wearing Iraqi army
uniforms burst into the home of a Sunni Arab sheik, killing him, three of his sons and a son-in-law in an attack police said may have been aimed at discouraging members of the minority from participating in next month's election.
Khadim Sarhid al-Hemaiyem, who lived on the outskirts of Baghdad, was the leader of a branch of the Dulaimi tribe, one of the biggest in Iraq
. His brother is a candidate in the Dec. 15 parliamentary election, three of his sons had been policemen and another son was slain last month north of the capital, police and family members said.