Four people were killed in Burundi on Monday (May 4) as police fired live rounds towards protesters according to AFP.
More than 40 others were injured.
For over a week demonstrators in the southeast African state have been rallying against President Pierre Nkurunziza standing for a third term.
Speaking from an official visit to Nairobi The United States Secretary of State John Kerry added his voice to calls for the president not to take part in the June election.
He said it is against the constitution.
The Vice President of the constitutional court which was due to decide if Nkurunziza’s bid is legal has fled the country.
He said he refused to be pressured to put his name to it.
Regional and European governments have also made the plea saying his candidacy risks undermining the Arusha peace deal which ended the ethnically fuelled civil war a decade ago.
As well as a crackdown on protesters the authorities also shut down the country’s main private radio station RPA which has spoken out against Nkurunziza.