MOSCOW, Russia (AFP) — Russian authorities said Sunday that they had brought a siege at a prison in the southern Rostov region to a swift end, killing the Islamic State (IS) hostage-takers and freeing their two prison guard captives unharmed.

The prison service had earlier reported that the two guards had been taken hostage by an unspecified number of IS detainees and had entered negotiations for their release.

But a short time later it issued a statement saying the siege had ended: “During a special operation...the criminals were liquidated and the employees who were taken hostage were released and were not injured.”

No further details were released in the immediate aftermath of the drama at Detention Center 1 in the Rostov region.

A police source told state news agency TASS that IS members who were due to appear in court on terrorism charges were among the hostage-takers.

They were reported to be holed up in the prison courtyard, armed with a pocket-knife, a baton and an axe, the source said.

The Interfax news agency said there were six hostage-takers who demanded to be provided with a car and be allowed to leave the prison in exchange for the release of the hostages.

Russian media reports speculated that the attackers could be among those arrested in 2022 for allegedly planning an attack on the Supreme Court of Karachay-Cherkessia, a Muslim-majority Russian republic in the Caucasus.

Russia has been repeatedly targeted by attacks claimed by IS militants, though the jihadist group’s influence in the country remains limited.