Security forces in Guinea killed a protester and wounded four others on Thursday, a medical source and witnesses said, as opposition supporters clashed with police during anti-government rallies.

"The victim was beaten with batons by security forces," said a hospital source in Labe, the country's second-largest city and an opposition stronghold.

The protester's body was carried to a regional hospital by fellow activists who cried "God is greater", "death to the dictator" and "justice for all", witnesses said.