Nigeria election: US and UK warn of vote-rigging
Britain and the United States have voiced concerns about irregularities in the counting of votes after Nigeria's elections.
In a joint statement they said they have seen disturbing signs that there has been political interference with the process.
The election commission says there will be a strong indication of who has won the presidential election by the end of Monday and that the final result should be announced on Tuesday.
Andrew Harding reports from Abuja.