The first batch of Sudan’s Rapid Support Forces (RSF) militia has arrived in the oil crescent region in central Libya to protect oil installations in order to allow forces loyal to warlord Khalifa Haftar to concentrate all their power on the Tripoli attack, Sudan’s Radio Dabanga reported Thursday.

Speaking to Radio Dabanga, a source estimated the number of troops to be about 1,000 out of the 4,000 troops expected to arrive in Libya in the next few months.

The RSF militia is made attractive by offering relatively high levels of pay.

Earlier, Al Jazeera unveiled documents that prove Sudan used its airspace to transport hundreds of mercenaries, recruited by Mohammed Hamdan Delgo (Hemitti) - deputy head of military council in Sudan -, from the Arab tribes in Darfur as well as neighbouring African countries to Libya, Yemen and Eritrea.