Rebels in Sudan's Darfur province say they have released 49 African peacekeepers they accused of entering their territory without permission. But rebels from the Justice and Equality Movement (Jem) say they are keeping three other people they suspect of being Sudanese security agents. The joint UN-African Union peace mission (Unamid) says the soldiers will not leave without their colleagues. Unamid says the three are a Yemeni policeman are two Sudanese translators. Jem said that most of those held on Sunday night were Senegalese Unamid troops but there were also soldiers from Ghana, Rwanda and Yemen. Earlier on Monday, a Unamid spokesperson told the BBC that there were "ongoing negotiations" to resolve the situation. Unamid said later that the peacekeepers were "able to leave" but were staying until their three colleagues were released. It insists that the Sudanese do not work for the government. A senior Jem official told the BBC that the three still being held are all Sudanese, and are being investigated. The rebels believe the men led the peacekeepers into Jem's territory. Senegalese troops operate mainly in the north-west of Darfur, near the border with Chad. The BBC's James Copnall in Khartoum says the incident highlights the lack of stability in Darfur. Fighting has died down since 2006 but three rebel groups are still fighting the government and Jem is the strongest of the three. Our correspondent says relations between Jem and Unamid have recently deteriorated. He says Jem has accused Unamid of supporting a reserve police force which Jem accuses of carrying out atrocities in Darfur. Jem says Unamid supplied the force with cars. Two million people are in refugee camps after nine years of conflict in Darfur. The UN estimates that more than 300,000 people have died in Darfur, mostly from disease, since rebels took up arms in 2003. The government in Khartoum puts the figure at about 12,000 deaths, and says the number of casualties has been exaggerated for political reasons. Sudanese President Omar al-Bashir is wanted by the Hague-based International Criminal Court for genocide, crimes against humanity and war crimes in Darfur. He denies the allegations.