Former Congo PM held in Kinshasa

Sources say Mr Kolelas was using a false identity

Former Congolese prime minister Bernard Kolelas has reportedly been arrested.

Security sources tell the BBC he was detained on Thursday in the Democratic Republic of Congo's capital, Kinshasa, but there is no official confirmation.

Mr Kolelas is seen as the main political opponent of the president, and went into exile after losing out in the civil wars of the 1990s.

He led the Ninja rebel movement, which fought President Sassou's government, until a ceasefire was signed in March.

President Dennis Sassou-Nguesso's government accuses him of still supporting the Ninjas who remain active in the Pool region near Brazzaville.

The BBC's Arnaud Zajtman says that highly-placed sources in the DR Congo police, the immigration services and a source close to one of the DR Congo vice-presidents have all confirmed Mr Kolelas's arrest on condition of anonymity.

Surviving Congo's Ninja rebels

According to one source at the airport, he landed in Kinshasa on Thursday morning at 0930 onboard a Kenya Airways plane from Nairobi and allegedly tried to go through customs under a fake identity.

He was immediately arrested and brought to the head office of the immigration services in the capital where he is still said to be being held.