One of the most-wanted suspects in the 1994 Rwandan genocide has been arrested in Uganda, police say.
Former intelligence chief Idelphonse Nizeyimana is accused of organising the killing of thousands of ethnic Tutsis - including the revered former queen.
Correspondents say he was travelling to Kenya from the Democratic Republic of Congo when he was detained.
Some 800,000 Tutsis and moderate Hutus were killed by Hutu militias during 100 days of slaughter.
The BBC's Will Ross, in the Kenyan capital Nairobi, says Mr Nizeyimana was detained in Kampala carrying false identity documents.
Mr Nizeyimana, a captain in the army, was head of intelligence and military operations during the genocide and is accused of setting up special military units to help carry out the slaughter.
One of these units is believed to have killed Queen Rosalie Gicanda, widow of King Mutara III who died in 1959 shortly before the country became a republic.
According to a 1999 report by US-based Human Rights Watch, Hutu soldiers took the queen from her home in the south-eastern town of Butare and shot her behind the national museum.
They also murdered several women who looked after the queen, who was about 80 years old when she died.
They returned the next day and shot her mother and pillaged her house.
The rights group said the murder of the queen, who had kept out of politics since her husband's death, alerted many Tutsis to the danger they faced.
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