Originally published by the Voice of America (www.voanews.com). Voice of America is funded by the US Federal Government and content it exclusively produces is in the public domain. Insurgent Attacks Kill at Least 40 in Iraq  -------------------------------------------- (http://enews.voanews.com/t?ctl=F55DDA:3919ACA Attacks occur just four days before a national referendum on a new constitution US soldiers walk by the wreck of a car bomb in Baghdad Iraqi police say insurgents have killed at least 40 people and wounded dozens more in attacks just four days before a national referendum on a new constitution. In the deadliest attack Tuesday, a suicide car bomber struck a crowded market in the town of Tal Afar, near the Syrian border, killing at least 30 people and wounding 45 others. In Kirkuk, at least three people were killed in a drive-by shooting, and in Baghdad a suicide car bomber killed at least seven people at an Iraqi army checkpoint. U.S. and Iraqi officials have repeatedly warned that insurgents - many of whom are Sunni Arabs - will step up attacks to undermine Saturday's constitutional referendum. Shi'ite and Kurdish political leaders have been pursuing last-minute negotiations with Sunni political leaders who are concerned their community will be sidelined under the constitution's proposed federal system. Some information for this report provided by AFP and AP. .