The men claim they are unarmed herdsmen arrested at the border but Chad says the identifications cards shown in the video prove their affiliation to the Sudanese army. 
 
"If the mercenaries attack us again, we will follow them wherever they go and I hope the Sudanese brothers allow us to follow them inside Sudan," Ahmat Allam, the Chadian foreign minister, said.

"Because they are the ones creating problems for us. They attack us in Chad and flee into Sudan."

Insufficient force
 
The conflict in the western Sudanese region of Darfur has killed an estimated 300,000 people, and left 2.3 million people homeless, in what the UN has called the world’s worst humanitarian crisis.

The claims from Chad come a day after Sudan agreed to the deployment of a 3,000-man strong UN peacekeeping force that is to support the struggling African Union troops already in in the country.
 
Ban Ki Moon, the UN secretary general, described the news as a “very positive sign” but both the US and UK called for a larger force on Tuesday.

IDs of the captured men allgedly show
their loyalty to the Sudanese army

Speaking in Chad, John Negroponte, the US deputy secretary of state, said that while Sudan's acceptance of an interim UN reinforcement in Darfur was "important", many more peacekeepers were needed for a total contingent of up to 20,000.

In London, Tony Blair, the British prime minister, also criticised Sudan's resistance to a bigger force, saying pressure must be put on Khartoum to make it "understand its responsibilities."

Fresh attacks

Meanwhile there were reports of more violence in the region.

Ibrahim al-Helu, a commander in one rebel faction of the Sudan Liberation Army, said government troops and militia had attacked 11 northern Darfur villages over the past three days.

"They killed more than 73 civilians ... People are fleeing the area," he told Reuters. He said his faction had engaged the attackers and fighting was still under way.

An army spokesman said the Sudanese armed forces had no operations in that area, and dismissed the violence as typical tribal clashes.