Kenyans should remain calm as the electoral commission, the IEBC, continues it work, international election observers have said in a joint statement.
The statement - from the African Union and the European Union among others - called on political parties "to use the legally provided channels of dispute resolution in case of any dissatisfaction with the process", adding that police should "avoid excessive use of force".
It also said the IEBC should carry out the tallying process "with full integrity and transparency".
Earlier, opposition leader Raila Odinga said the preliminary results, showing a strong lead for President Uhuru Kenyatta, were incorrect after the IEBC's computer system had been hacked.
The IEBC is investigating the claims but is continuing to publish the forms showing the written returns from each polling station so that they can be compared with what is being announced on the commission's website.