LONDON, Oct 23 (Reuters) - Ex-UBS trader Kweku Adoboli was warned by the Swiss bank about a "rogue trading" scandal at France's Societe Generale years before he was charged with fraud over losses of $2.3 billion at UBS, a London court heard on Tuesday.

* Nigerian Qua Iboe valued at dated plus $2 or less * Demand lull weighs on sentiment * Forcados, Bonny exports delayed LONDON, Oct 23 (Reuters) - Nigerian crude oil premiums remained under pressure on Tuesday due to lacklustre demand from big buyers China and India, although export delays affecting the Bonny and Forcados crude streams could provide support. On Monday, Shell said its Nigerian venture had declared force majeure on exports of the Bonny and Forcados crudes. Traders

CONAKRY (Reuters) - Two years ago, Guinea's first freely-elected president Alpha Conde promised to unite "every son" of his nation; today the man with ambitions to become West Africa's Nelson Mandela is struggling to halt a wave of ethnic unrest.

Tunis (Reuters) - The leader of radical Islamist group Ansar al-Sharia in Tunisia on Tuesday accused the country's government of being a puppet of the United States and un-Islamic, urging it to release Salafists jailed after an attack on the U.S. embassy last month.

CAIRO (Reuters) - Egypt's prime minister denied a report that he asked Algeria's government for $2 billion to shore up a struggling economy during an official visit to the country this week, Egypt's state news agency reported.

COTONOU (Reuters) - Benin authorities arrested the niece and personal doctor of President Boni Yayi, claiming they had tried to poison him at the behest of an angered businessman, the country's state prosecutor said.

LAGOS (Reuters) - Nigerian authorities seized a ship and arrested its 15 Russian crew members on suspicion of arms smuggling, after they found several guns and about 8,500 rounds of ammunition on the boat, the Navy said on Tuesday.

KHARTOUM (Reuters) - Sudanese rebels said they had shelled the main city in the oil-producing South Kordofan state near the border with South Sudan after coming under artillery fire from government troops, the third bout of shelling in the past two weeks.

KAMPALA (Reuters) - An outbreak of the deadly Marburg virus in Uganda has spread to the capital Kampala after an infected woman travelled to the city and the death toll from the disease, a cousin of Ebola, climbed to five, a health official said on Monday.

RUSTENBURG, South Africa (Reuters) - Police in South Africa shot at least a dozen striking miners in the back during the so-called "Marikana Massacre" in August, lawyers said on Monday, undermining arguments that officers acted in self defence when they killed 34 people.

JOHANNESBURG (Reuters) - Alf Khumalo, a South African photographer whose pictures of the brutalities of the apartheid regime piled pressure on the white-minority government, has died of renal failure at the age of 82.

MOGADISHU (Reuters) - Somali pirates said on Monday they have freed the Panama-flagged merchant ship MV Orna after receiving a ransom of $400,000, but detained six of the crew to get more money for them.

ADDIS ABABA (Reuters) - Four people were killed in eastern Ethiopia when a group of armed demonstrators raided a police station following protests over alleged government interference in Muslim affairs, an official said on Monday.

CAIRO (Reuters) - The time left for the completion of Egypt's constitution might not be enough to resolve disputes which threaten its legitimacy, according to a legal expert who says failure to forge a consensus could lead to instability in government.

NIAMEY (Reuters) - Niger said on Monday it will launch a $110 million project to counter the impact of rapid expansion of deserts and increasingly unpredictable rains in one of the world's poorest countries.

The following company announcements, scheduled economic indicators, debt and currency market moves and political events may affect African markets on Tuesday. - - - - - EVENTS: Botswana - Bank of Botswana to auction 14 day certificate Treasury Bill GLOBAL MARKETS Asian shares inched down on caution over the region's new corporate reporting season, after global shares faltered overnight on weak earning reports and outlook. WORLD OIL PRICES Brent futures held st

UNITED NATIONS/ACCRA (Reuters) - Argentina's foreign minister launched a diplomatic offensive in New York on Monday, urging top U.N. officials to pressure Ghana to release an Argentine naval training vessel seized after creditors won a court order to keep the ship in port.

BERLIN (Reuters) - Germany could take part in any European training mission to Mali to help its government prepare troops to counter Islamist insurgents in the north of the African country, Chancellor Angela Merkel said on Monday.

BOCA RATON, Florida (Reuters) - President Barack Obama repeatedly attacked Republican challenger Mitt Romney on foreign policy on Monday in their third and final debate in an effort to blunt his opponent's surge in the polls with two weeks left until Election Day.