A suicide car bomber in northern Iraq has killed at least 20 people at the funeral of a local Kurdish official. The blast in Tal Afar wounded 30 others taking part in the funeral procession. In Baghdad, insurgents gunned down five Iraqi policemen at a checkpoint Sunday. And a car bomber killed four Iraqis in an attack on a U.S. military convoy. In other developments, a new video shows a bound blond-haired man surrounded by gunmen. The man claims to be a 63-year-old Australian national, and he urges coalition forces to leave Iraq. Authorities are working to confirm whether the man is a new kidnap victim. Meanwhile, Iraqi police say five suspects arrested in the kidnapping and murder of British aid worker Margaret Hassan have admitted involvement in her death. Police say the suspects were detained early Sunday south of Baghdad.