This comes as concerns grow over the credibility of Tanzania's elections.
The United States says it has serious doubts over irregularities, a concern also shared by the opposition.
The vote has been marred by complaints of restricted internet access and fraud.
Al Jazeera's Catherine Soi reports from Nairobi in neighbouring Kenya.
- Subscribe to our channel: http://aje.io/AJSubscribe
- Follow us on Twitter: https://twitter.com/AJEnglish
- Find us on Facebook: https://www.facebook.com/aljazeera
- Check our website: https://www.aljazeera.com/
#AlJazeeraEnglish #Tanzania #election