Harare, Zimbabwe (CNN) Zimbabwe President Emmerson Mnangagwa has called violence by the country's security forces "unacceptable and a betrayal" following deadly protests last week sparked by a sharp fuel price hike.

Mnangagwa's comments were his first on the strife which has wracked Zimbabwe for over a week, during which the President was largely absent. He arrived back in Harare Tuesday from Switzerland, where he had been due to attend the World Economic Forum (WEF) meeting.

"One week ago I announced measures to stabilize our nation's crucial fuel supply. I was aware that these measures may not be popular, and this was not a decision we took lightly. But it was the right thing to do," Mnangagwa said on Twitter.

"What followed was regrettable and tragic. Everyone has the right to protest, but this was not a peaceful protest. Wanton violence and cynical destruction; looting police stations, stealing guns and uniforms; incitement and threats of violence. This is not the Zimbabwean way."

He added that "violence or misconduct by our security forces is unacceptable and a betrayal of the new Zimbabwe. Chaos and insubordination will not be tolerated. Misconduct will be investigated. If required, heads will roll."

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