A human rights group says Sudanese army troops raped at least 221 women and girls in a Darfur village in a series of organized, house-to-house attacks late last year.

The Human Rights Watch report released Wednesday calls the mass rape "a new low in the catalog of atrocities in Darfur."

The international community has pressed repeatedly for access to investigate the alleged attacks that witnesses and survivors say began Oct. 30 and lasted 36 hours.

Sudan's government says its own investigation found that "there had not been a single case of rape."

But the new report based on more than 130 interviews says girls as young as 10 were raped by Sudanese army forces, and that some women and girls were assaulted multiple times and in front of their families.