Malian and Nigerien security sources have confirmed that the intelligence chief in Muammar Gaddafi's fallen dictatorial government has passed from Niger into Mali.
"Abdullah al-Senoussi has arrived in the Malian desert from Niger," AFP quoted a Nigerien security source as saying on condition of anonymity on Thursday.
A Malian security source also confirmed the information, and said 62-year-old Senoussi was travelling with a small group.
It was not known if Saif al-Islam Gaddafi, the influential second son of the slain Libyan ruler, accompanied the group.
On Wednesday, an adviser to Niger's president said Senoussi had entered the Western African country.
The adviser, who is also an influential leader within the ethnic Tuareg community, said that the intelligence chief in Gaddafi's deposed authoritarian regime entered Niger in a convoy directed by Tuareg drivers.
Saif al-Islam is reportedly making his way towards Niger in an attempt to flee the country after the victory of the revolution. Former Tuareg leader Rissa ag Boula said on Tuesday that he is being ferried by Tuareg tribesmen.
His brother Sa'adi took the same route to Niger to flee Libya in September.
Saif al-Islam is wanted by the International Criminal Court for committing crimes against humanity.
Gaddafi was killed in Sirte, situated 400 kilometers (250 miles) east of Tripoli, last week, eight months into an uprising that put an end to his 42-year dictatorship.
On Tuesday, Gaddafi and his son Mu'tassim were buried in a secret location in the country's Sahara desert, Abdel Majid Mlegta, a senior National Transitional Council military official, said.