BAGHDAD, Iraq – Terrorists slaughtered 11 Iraqi soldiers, beheading one then shooting the others execution-style, and declared on an Islamic terrorist Web site yesterday that Iraqi fighters will avenge “the blood” of women and children killed in American strikes on the guerrilla stronghold of Fallujah.

The wave of foreigner kidnappings claimed another victim – a Polish woman in her 60s who is married to an Iraqi. Her captors demanded that Poland withdraw its 2,400 soldiers and that the American-led coalition free all Iraqi women held at Abu Ghraib prison.

Also, the Japanese government convened an emergency session Friday following a press report that a body believed to be Asian was discovered in Iraq.

Kyodo News agency, citing China News Service and unidentified Russian press, said the body was discovered in Tikrit, Iraq, but that it was not known whether it was a Japanese man taken hostage this week by terrorists.

Prime Minister Koizumi and other top officials gathered at his office immediately following the report, an official said on condition of anonymity.

Islamic terrorists holding Shosei Koda had threatened Tuesday to kill him within 48 hours unless Japan withdrew its troops from Iraq. Tokyo has stood firm in its refusal to withdraw its troops from Iraq.

The killing of the 11 Iraqi National Guardsmen was claimed by the Ansar al-Sunnah Army, which posted a videotape of their brutal deaths on its Web site yesterday along with a warning for all Iraqi police and soldiers to desert or face death. The terrorists said earlier the soldiers were abducted this week on the road between Baghdad and Hillah, 60 miles to the south.

After forcing each of the soldiers to state his name and unit, the terrorists forced one of them to the ground and sawed off his head. The others were forced to kneel with their hands bound as a gunman fired shots into the back of their heads.

A voice on the videotape warned all Iraqi soldiers and police to “repent to God, abandon your weapons, go home, and beware of supporting the apostate Crusaders or their followers, the Iraqi government, or else you will only find death.”

“We will not forget the blood of our elderly, our women and our children that is shed daily in Fallujah, Samarra, Ramadi, and elsewhere,” a statement on the Web site said. The al-Sunnah movement has claimed responsibility for a number of attacks and hostage takings, including the slaying of 12 Nepalese hostages in August.

Elsewhere, two more American soldiers were killed – one in a car bombing in Baghdad and the other in an ambush near Balad, 40 miles north of the capital. American Marines also captured 16 suspected terrorists in a sweep south of Baghdad, bombed a suspected insurgent safe house in Fallujah, and clashed with guerrillas in Ramadi.

Also yesterday, a videotape broadcast by Al Jazeera TV showed two truck drivers – from Bangladesh and Sri Lanka – who were taken hostage. Al Jazeera said the men, shown on the tape wearing flak jackets, worked for a Kuwaiti company.

The video of the Polish hostage, also aired on Al Jazeera, showed a middle-aged woman with gray hair wearing a polka-dotted blouse sitting in front of two masked gunmen, one of whom was pointing a pistol at her head.

The woman was identified as Teresa Borcz-Kalifa by one of her former superiors at the Polish Embassy in Baghdad, where she worked in the 1990s. Leszek Adamiec told Poland’s private Radio Zet that Ms. Borcz-Kalifa worked in the consular section until 1994.

The woman,a longtime resident with Iraqi citizenship, was believed to have been abducted Wednesday night from her home in Baghdad, Polish authorities said. She was the ninth foreign woman abducted in Iraq since a wave of kidnappings began last spring. By comparison, Iraqi officials say that at least 152 Iraqis have been kidnapped this month – the highest monthly total since the occupation began last year.

Ms. Borcz-Kalifa’s abduction was claimed by the Abu Bakr al-Siddiq Fundamentalist Brigades.

Her voice was not audible on the tape, but Al Jazeera said she urged Polish troops to leave the country and for American and Iraqi authorities to release all female detainees from Abu Ghraib. The kidnappers did not mention a specific death threat or give a deadline. President Kwasniewski said Poland would not surrender “to the dictate of terrorists” by meeting the demands.

All but two foreign women hostages have been released, and in a statement issued yesterday in London, CARE International appealed for the release of Margaret Hassan, a British-Irish-Iraqi citizen who has headed the humanitarian organization’s operations in Iraq since 1991.