The Afghan Taliban have rejected Pakistan's allegation that Tuesday's deadly hostage-taking of a train was planned and directed from Afghan soil.

Afghanistan's Ministry of Foreign Affairs called Pakistan's assertions "baseless," in a statement Thursday.

"We categorically reject baseless allegations by Pakistani army spokesperson linking attack on a passenger train in Balochistan province with Afghanistan," foreign ministry spokesperson Abdul Qahar Balkhi said in a statement posted on X.

Militants linked with the banned Baloch Liberation Army attacked a passenger train Tuesday near Sibi, Balochistan, taking hundreds hostage.

At least 21 passengers and four paramilitary troops died in the attack. The military claimed the killing of 33 terrorists.

Lieutenant General Ahmed Sharif Chaudhry, director general of the Pakistani military's media wing Inter Services Public Relations, had earlier said attackers collaborated with partners in Afghanistan.

"During the operation, these terrorists were in contact with their supporters and masterminds in Afghanistan via satellite phone," Chaudhry told a private news channel as he declared the clearance operation over Wednesday night.

Later, the military's media wing reiterated the assertion.

"Intelligence reports have unequivocally confirmed that the attack was orchestrated and directed by terrorist ringleaders operating from Afghanistan, who were in direct communication with terrorists throughout the incident," a statement from the ISPR said.

Rebutting the claim, Balkhi said Islamabad must address internal issues.

"[We] urge Pakistani side to focus on resolving their own security and internal problems instead of such irresponsible remarks," the Taliban foreign ministry spokesperson said.

Tuesday's attack marked a dramatic escalation in the separatist insurgency that has ravaged Balochistan for nearly two decades.

The militants blew up tracks, bringing the train with nearly 450 passengers to a halt in a tunnel, where they stormed it.

Survivors told VOA the attackers singled out security personnel and ethnic Punjabi passengers, shooting many.

"Pakistan expects the Interim Afghan Government to uphold its responsibilities and deny use of its soil for terrorist activities against Pakistan," the military said in written comments to the media Wednesday, repeating an increasingly frequent demand.

On Thursday, the spokesperson for Pakistan's Ministry of Foreign Affairs, Ambassador Shafqat Ali Khan, repeated Islamabad's stance.

"We urge Afghanistan to hold perpetrators, organizers, financiers, of this reprehensible act of terrorism accountable and cooperate with the government of Pakistan to bring all those who are concerned with this attack, including the real sponsors of terrorism, to justice," Khan told media at the weekly briefing.

Balkhi rejected the allegation that Baloch separatists have put down roots across the border.

"No members of Balouch opposition have presence in Afghanistan, nor have they ever had or have any links with the Islamic Emirate," Balkhi said in his post on X. The Taliban refer to their government as the Islamic Emirate.

Pakistan has seen a sharp increase in terrorism in the last year, with deaths rising by nearly 45% in 2024 from the year before.

The country now ranks second on the Global Terrorism Watchlist with Tehreek-e-Taliban Pakistan, or TTP, an ideological offshoot of the Afghan Taliban, and the separatist Baloch Liberation Army emerging as the deadliest outfits.

Speaking at a United Nations Security Council meeting on Afghanistan this week, Pakistan's permanent representative to the United Nations, Munir Akram, said Kabul was failing to rein in Baloch separatists.

"The Kabul authorities have failed to address the threat posed to the region and beyond by other terrorist groups, such as al Qaida, the TTP and Baloch terrorists, including the BLA and the Majeed Brigade, which are present in Afghanistan," the Pakistani envoy said Monday.