Amnesty, HRW accuse Sudanese government of bombing civilians and blocking aid workers in South Kordofan.

More than 150,000 people have fled the fighting in South Kordofan since June, according to rights groups [EPA]

The Sudanese government has killed at least 26 civilians this month
by "indiscriminately bombing civilian areas" in the Nuba Mountains
region, according to a new report from Amnesty International and Human
Rights Watch.

Researchers from both groups traveled to the region and reported
government planes dropping bombs in populated areas. "No evident
military targets were visible near any of the air strike locations,"
they wrote. The bombing has reportedly wounded dozens of people,
including a number of women and children.

More than 150,000 people have fled their homes since June, with many
hiding out in caves, abandoned homes and other makeshift shelters.

Khartoum has been fighting armed groups for months in South Kordofan, the state which includes the Nuba Mountains region.

Sudanese officials insist that their bombing raids have only targeted
rebels: Daffa-Alla Elhaj Ali Osman, the Sudanese ambmindador at the
United Nations, told Al Jazeera last month that rebels were responsible for civilian casualties.

But the report from Amnesty and HRW notes that many of the bombs used
are unguided - in some cases, simply rolled out of cargo planes - and
cannot be directed at military targets.

"Use of weapons in a civilian area that cannot accurately be directed
at a military objective makes such strikes inherently indiscriminate,
in violation of international humanitarian law," the groups said in
their report.

Hunger a growing problem

The Sudanese government has blocked international aid agencies from
entering South Kordofan, and insists that all aid to the region be
delivered through the Sudanese Red Crescent.

Food supplies are rapidly dwindling: The World Food Programme only
has enough stockpiled to feed 23,000 people for ten days. Researchers
said many people have been forced to supplement their dwindling food aid
with wild berries and leaves.

South Kordofan borders South Sudan, which broke away from the north last month to become an independent nation.
It has a large population of ethnic Nuba groups, many of which are
linked to the Sudan People's Liberation Movement, the rebel group which
fought the north for decades.

SPLM fighters and other militia groups in southern Sudan have also been linked to widespread human rights abuses.

The 2005 Comprehensive Peace Agreement between north and south
requires "popular consultations" this year on South Kordofan's status,
but that process has not yet begun.

Khartoum announced a two-week cease-fire in South Kordofan earlier this month.

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