RIYADH, Nov 17, 2007 (AFP) - Venezuelan President Hugo Chavez opened an OPEC summit on Saturday with a chilling warning about 200-dollar oil if the United States attacks Iran in a speech that also urged the cartel to be more political.

But internal divisions about the role of the oil exporters' group were highlighted when King Abdullah of Saudi Arabia, OPEC kingpin and key US regional ally, sounded a moderate note, saying oil 'must not become an instrument for conflict.'

Par by Susan Njanji

BO (Sierra Leone), 7 sept 2007 (AFP) - Sierra Leoneans on Saturday vote in a tight presidential run-off seen to test the west African country's ability to cement peace following the end of one of the most brutal civil wars in modern times.

The election pits candidates from the parties that have ruled the country the longest: the opposition All People's Congress (APC)'s leader Ernest Koroma and Vice President Solomon Berewa from the ruling Sierra Leone People's Party (SLPP).