Dozens of people rescued from a train hijacked by separatist militants in southwest Pakistan arrived on Thursday in the city of Quetta, hours after security forces killed all 33 attackers to end a day-long standoff.

Terrorists in explosive vests have reportedly threatened Pakistan train passengers' lives if officials refuse to release imprisoned militants.

The separatist Baloch Liberation Army claimed responsibility for attacking the train carrying 440 passengers in a tunnel in a remote part of Balochistan. Spokesman Jeeyand Baloch had said the group was ready to free passengers if authorities agree to release jailed militants.

Baloch separatist militants blew up a railway track and launched rockets at the Jaffar Express, which was carrying over 400 passengers.

ISLAMABAD -- Twenty-one passengers, four soldiers and 33 terrorists were killed after heavily armed terrorists attacked a passenger train and held scores hostage in the country's southwestern Balochistan province, the Inter-Services Public Relations (ISPR), the media wing of the Pakistan Army, said in a statement late Wednesday night.

Militants hijacked a train in Balochistan, killing 21 passengers and four soldiers. The army succeeded in a rescue operation, killing 33 militants and freeing remaining hostages. The Jaffar Express, en route from Quetta to Peshawar,

Authorities in Pakistan have sent the last remaining civilian survivors of a hijacked train to Quetta under heavy security.