Left-wing Cameroonian opposition figure Anicet Ekane has died in detention, five weeks after he was arrested, his lawyers and party have announced.

Ekane, 74, was among the leaders of an opposition coalition who endorsed Issa Tchiroma Bakary in October's presidential election.

Tchiroma Bakary says he was the rightful winner of the poll, officially won by 92-year-old incumbent Paul Biya. Tchiroma Bakary has since fled to The Gambia.

No official cause of Ekane's death has been announced. His party has accused the authorities of denying him access to his medication - a charge the government has denied.

According to a spokesman for Ekane's African Movement for New Independence and Democracy (Manidem) party, Ekane died on Monday morning at a military medical facility, after his health worsened over the weekend.