A suicide bomber in Baghdad killed at least eight people and wounded about 30 others Wednesday morning.

Iraqi police say the attacker walked up to a group of men waiting for work (as day laborers) on construction sites and detonated explosives strapped to his body.

In other developments, Arabic-language al-Jazeera television aired video of two German hostages Tuesday, and said kidnappers have threatened to kill them within 72 hours unless Germany ends its cooperation with Iraqi authorities and closes its Baghdad embassy.

The videotape - which did not have sound - showed the hostages sitting on a floor, with masked men pointing automatic rifles at them.

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

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