LEXINGTON, Nov 18 (AFP) - Horrific new allegations suggesting children as young as five were ordered to murder a man have emerged in a case already involving claims of ritualistic child sex abuse.

Details of the so-called "Mohler case" were first revealed last week, when authorities arrested a 77-year-old man and his four sons and filed a string of sex abuse charges, including rape, sodomy and bestiality, against them.

The victims of the men are said to be the six grandchildren of Burrell Edward Mohler Sr., who reportedly endured horrendous abuse between 1988 and 1995 at a farmhouse in Bates City, Missouri.

The allegations came to light years when one of the grandchildren involved went to police in August to tell her story.

The woman described nine incidents of abuse which she believes began when she was about five and ended after she became pregnant and was forced to have an abortion at age 11.

The abuse included elaborate "wedding" ceremonies in which the girls would pick flowers to adorn their hair and wear special dresses.

Her claims were backed by testimony her siblings provided, as well as glass jars buried across the farm containing notes the children had written detailing the horrific abuse.

The latest details to emerge from the case are allegations that Mohler Sr. forced three of his granddaughters , then aged five, six and eight to help him kidnap a stranger from a shopping center in Independence, Missouri.

The man was allegedly taken back to the farm where Mohler Sr threatened to kill the girls if they did not attack and murder the kidnap victim.

They were then ordered to dig a grave for the man, who has not been identified.

Police searching the farmhouse property last week said they had uncovered a bone of an unknown type, a credit card, eye glasses and the sole of a shoe or boot.

A search warrant affidavit revealed late Monday that another alleged victim has come forward after seeing reports of the Mohler arrests last week.

The woman, who is unrelated to the Mohlers, told authorities that she was held in the basement at a farm for as long as two years and was repeatedly raped.

She said she had a baby that Mohler Sr. and his son Burrell E. Mohler Jr. buried in a box in the basement's dirt floor. The floor was later concreted over.

Authorities searched the property for two days last week, at times using ground-penetrating radar to search the basement and found an object "consistent with the shape of a box" under the concrete floor, the affidavit said. Jars of soil were removed for analysis.

The five accused men, Mohler Sr., 77; Mohler Jr., 53; David Mohler, 52; Jared Mohler, 48; and Roland Mohler, 47, attended a hearing Tuesday.

Family members took up much of the front row of the courtroom's seating, and Roland Mohler winked at one as he came in. One relative, William Bruch, a cousin of the senior Mohler, said he could not believe the accusations.

"Those boys grew up fine young men, and if I could tell them anything, it would be to hold their heads high and keep their courage up," he said.

Also Tuesday, Mohler Sr.'s brother Darrel, 72, agreed to be extradited from Florida to Missouri. He is charged with two counts of forcible rape in the case.