Baghdad - Insurgents determined to wreck Iraq's upcoming constitutional referendum killed more than 40 people and wounded dozens in several attacks Tuesday, including a suicide car bomb that ripped apart a crowded market in a town near the Syrian border.
U.S. and Iraqi officials have repeatedly warned that the insurgents would step up their attacks to undermine Saturday's vote, a crucial step in Iraq's democratic transition.
In the deadliest attack in nearly two weeks, a suicide car bomb exploded at about 11 a.m. in a crowded open market in the northwestern town of Tal Afar, killing 30 Iraqis and wounding 45, said Brig. Najim Abdullah, Tal Afar's police chief. U.S and Iraqi forces routed insurgents in a major offensive there last month.
He said all the victims appeared to be civilians since no Iraqi or U.S. forces were in the center of Tal Afar, which is 260 miles northwest of Baghdad.

Nine Attacks in Baghdad
Insurgents also used two suicide car bombs, three roadside bombs and four drive-by shootings in the capital on Tuesday to kill a total of 14 Iraqis; 29 were wounded, police said. The worst attack involved a suicide car bomb that exploded about noon at an Iraqi army checkpoint in a busy area of western Baghdad, killing eight Iraqi soldiers and one civilian and wounding 12 soldiers, said police Capt. Qassim Hussein.
The violence came four days ahead of Iraq's key vote on the draft constitution, which Kurds and the majority Shiites largely support and the Sunni Arab minority rejects. Sunnis are campaigning to defeat the charter at the polls, although officials from all sides have been trying up to the last minute to decide on changes to the constitution to swing Sunni support.
Many Sunnis fear the document would create nearly autonomous Kurdish and Shiite mini-states in the north and south, where Iraq's oil wealth is located, and leave most Sunnis isolated in central and western Iraq under a weak central government in Baghdad. Whether the constitution passes or fails, Iraq is due to hold elections for a new parliament on Dec. 15.
Militants are demanding that Iraqis boycott the referendum and have killed at least 384 people in the last 16 days in a series of attacks.