The Iraqi husband of kidnapped aid worker Margaret Hassan has appeared on Arabic television appealing to her unknown kidnappers for her safe release during this Muslim holy month of Ramadan.

Tahseen Ali Hassan said video of his captive wife that appeared yesterday (Friday) upset him, and has saddened and worried his wife's family and friends.

In the tape sent to al-Jazeera, the CARE International country director tearfully appealed to British Prime Minister Tony Blair to withdraw his country's troops from Iraq and not to redeploy any to the Baghdad area.

CARE International also has called for Mrs. Hassan's safe release, saying she is a humanitarian who has lived and worked in Iraq for more than 30 years.

Insurgents in Iraq have again targeted the country's security forces, killing at least 20 police and National Guards in two suicide car bombings.

In the first attack, 16 policemen were killed near a military base west of Baghdad. In the second bombing, four National Guards were killed at a checkpoint south of Samarra.

In Baghdad, a roadside bomb injured six American soldiers.

Meanwhile, the Army of Ansar al-Sunna militant group has posted pictures on its website that are allegedly of the beheading of an Iraqi man it accused of being a spy for U.S. forces in Mosul.

The violence came as the U.S. military said a senior member of Abu Musab al-Zarqawi's terror network was captured during a pre-dawn raid in Fallujah.