A brawl in an Athens prison wing housing foreigners left at least two inmates dead and 21 others injured on Sunday, many seriously, authorities said.

The fight, involving makeshift knives, happened in the Korydallos prison over control of Wing C, authorities said. The two dead inmates are Pakistani, ABC News reported.

Prisoners of Albanian and Arab origin clashed with Pakistani inmates right after dinner on Sunday, and just before prisoners were led back to their cells, a justice ministry official said. The attack involved makeshift knives.

The official, speaking on condition of anonymity because he wasn't authorized to give details about an ongoing investigation, said the injured have been transferred to an outside hospital and at least two are in critical condition. He said the situation inside the prison was now calm.

After the attack, a police SWAT team was waiting outside the prison in preparation for a raid to search for weapons in Wing C, one of two wings that houses foreigners.

The Korydallos prison, Greece's largest, is overpopulated like most Greek prisons. It houses more than 2,000 convicts and inmates in six wings.