Nine dangerous inmates remain at large after a shocking escape from a Louisiana prison, where authorities say the group may have received help from someone inside the facility.

At around 8.30am Friday morning, 10 inmates considered 'armed and dangerous' were discovered missing during a routine head count at Orleans Parish Jail, according to the New Orleans Police Department.

According to Orleans Parish Sheriff Susan Hutson, the inmates managed to escape from their cell after breaching a wall behind a toilet. Authorities believe that they fled shortly after midnight, and may have had 'inside' help.

'We have indication that these detainees received assistance in their escape from individuals inside of our department,' Hutson said.

After breaching the wall at the Orleans Justice Center, the escapees scaled another wall and managed to cross the interstate, the sheriff added.