Two convicted murderers have held two guards hostage in a Swedish prison for hours, demanding pizza and kebab for 20 fellow inmates.

The police decided to deliver the pizzas, freeing one of the hostage guards.

Later, the detained kidnappers also released the second guard, although the other requirement was not met: a helicopter for a flight to freedom.

The hostage situation was in a prison with the highest security level, more than 100 kilometers west of the Swedish capital Stockholm.

The two criminals had armed themselves with razor blades, Swedish media report.