Nigeria’s opposition parties have asked the parliament to annul last weekend’s presidential poll, which ruling party candidate Umaru Yar’Adua won by a landslide in the polls, and set up an interim administration to take over government. They also called for a re-run of all recent elections described as “flawed” by local and international observers. The opposition also called on Nigerians to troop out to the streets on 1 May to reject the “sham elections” and call for their cancellation. (BBC)