MAPUTO, Mozambique — At least 6,000 inmates escaped from a high-security prison in Mozambique’s capital on Christmas Day after a rebellion, the country's police chief said, as widespread post-election riots and violence continue to engulf the country.

Thirty-three inmates were killed and 15 others sustained injuries during a violent clash with the prison's security forces.

Mozambique is experiencing escalating civil unrest linked to October’s disputed election, which extended long-ruling party Frelimo’s stay in power. Opposition groups and their supporters claim the vote was rigged.