Muhyadin Ahmed Roble, AfricaNews reporter in Nairobi, Kenya
Chad authorities arrested four senior former Chadian rebels on their return to the country's Capital of Ndjamena, government and rebels said.

The arrested officials included General Taher Guinassou, a former security advisor to Chad's President Idriss Deby, who went to be vice president of the UFDD rebels and Tahir Wodji who was a senior commander and in the UFDD and a broader rebel alliance.
"These officials were convicted in absentia by Chad's justice system for providing the enemy with intelligence, attacking the country and the destruction of public property," government spokesman Pahimi Deubet Kazeubet said.
"The prosecutor launched the international arrest warrants for them and they were arrested," the spokesman said.
A Paris-based rebel spokesman for the UFDD issued a statement condemning the arrests and urged Chadians "to continue the struggle and passive resistance" against Cheby.
Analysts say the move could dissuade other former fighters from laying down arms after years of fighting against Chad army force.
Chad and Sudan have strengthened their ties since genocide-accused Sudanese President Omar al-Bashir attended a regional summit in Ndjamena in July.
The Sudanese and Chadian border forces were created this year to stop Darfur rebels crossing the frontier in search of supplies.
Both countries accused each other of supporting each other's rebels, who are mostly based on the borders between Sudan and Chad since 2004.
Some of the rebel leaders who fly from Khartoum went to Chad and returned to Deby's coalition or taken up jobs in government.
Hundreds of fighters have left the bush but there are still hundreds more in the lawless east, where lines are blurred between rebellion and banditry.