Iraqi police say a suicide bomber has blown himself up in a crowd of Iraqi army recruits, killing at least 30 people and injuring 35 others at an army base near the Syrian border.
Today's attack in Tal Afar, was the second in the town in two days. On Tuesday, a suicide car bomber struck a busy market killing 30 people.
U.S. and Iraqi officials have warned of an increase in violence ahead of Saturday's constitutional referendum.
Late Tuesday, Iraq's main Sunni Arab political party - the Iraqi Islamic Party - announced its support for the draft constitution, after Shi'ite and Kurdish negotiators agreed to allow parliament to consider amendments to the constitution.
Parliament will discuss the deal at a special session later Wednesday.
It is unclear if other Sunni groups not involved in the negotiations will reverse their calls for voters to reject the constitution.
Some information for this report provided by AFP, AP and Reuters.