Witnesses in Baghdad say a bomb blast outside the Iraqi national journalists' union has wounded the union's leader and at least three other people.

Witnesses say the bomb exploded in central Baghdad Saturday as the union leader was saying goodbye to three guests.

No one has claimed responsibility for the attack.

Gunmen shot and fatally wounded the union's former leader, Shihab al-Tamimi, in February.  The official died of his wounds four days after being ambushed in Baghdad.

The international Committee to Protect Journalists says Iraq has become the world's most dangerous country for journalists since the U.S.-led invasion in 2003.

The United States invaded Iraq citing concerns about alleged weapons of mass destruction programs.  No such weapons were found.

Some information for this report was provided by AFP and Reuters.