The government of Burundi has said it will not attend peace talks scheduled to resume in Tanzania on Thursday, although the main opposition alliance has confirmed its participation.

The talks are meant to find an end to a violent political crisis that began in 2015 after President Pierre Nkurunziza said he would seek a third term – a move opponents said violated the constitution and a peace deal that ended an ethnically charged civil war.

“The government of Burundi finds some irregularities in the organisation of this present session,” a government statement said on Wednesday. Spokesman Phillipe Nzobonariba said the government objected to the presence of senior U.N. adviser Benomar Jamal, but did not say why.

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