A bomb in Baghdad has killed at least eight people and wounded at least 50 others.

Iraqi police say Wednesday's attack took place where laborers were waiting for work. 

Meanwhile, roadside bombs in Amiriyah and Baquba killed two people.

Also Wednesday, German Foreign Minister Frank-Walter Steinmeier appealed for the release of two German hostages in Iraq.  He made the comment after a cabinet meeting in Berlin.

Arabic-language al-Jazeera television aired video Tuesday of the Germans, and said the kidnappers have threatened to kill them within 72 hours unless Germany cuts ties with Iraq. 

The men were abducted January 24 in the northern city of Baiji.

Meanwhile, Sunni Arab political leader Tariq al-Hashimi has threatened a campaign of civil uprising if some security demands are not met.

The demands include the release of detainees and ending security sweeps by Interior Ministry forces, who have been accused of targeting Sunnis.

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