A suicide bomber attacked a school bus in south-western Pakistan on Wednesday. The explosion killed three students of a military-run school. The explosion occurred in Khuzdar city, Balochistan province, the officials said.

Senior provincial official Yasir Dashti said the bus had "a large number" of children of military personnel. He confirmed 38 people were injured in the attack. The bus was carrying Army Public School children, said Kaleem Ullah, a police officer in Khuzdar.

Army Public Schools have branches throughout Pakistan for children of the military. The Pakistan military reported that at least three children and two adults were killed in the attack. No group has claimed responsibility yet.

Balochistan has suffered years of violence from separatist insurgent groups who demand independence and control over resources. 

Soon after the explosion, Pakistan's army blamed "Indian proxies" for conducting the attack. The army provided no evidence to substantiate this charge. Pakistan has also blamed India for previous attacks in Balochistan. India has denied these allegations.

Prime Minister Shehbaz Sharif "strongly condemned the cowardly attack" in a formal statement. He repeated the army's claim that India conducted the bombing.

The bomb attack occurred barely more than two months after a fatal train hijacking by Baloch separatist militants in Balochistan. In that attack, the Baloch Liberation Army hijacked over 350 individuals, out of which some of them were security personnel. The militants killed 27 individuals.

India on Wednesday dismissed the Pakistani military's "baseless allegations" of its involvement in the Khuzdar school bus attack.

Randhir Jaiswal, India's Ministry of External Affairs spokesperson, vehemently denied the claims made by the Pakistan military media arm, Inter-Services Public Relations (ISPR). The ISPR had stated the attack was "planned and orchestrated by the terrorist state of India and carried out by its proxies."

Jaiswal dismissed it and stated, "India condoles the loss of lives in all such incidents." He further added, "However, in order to divert attention from its reputation as the global epicentre of terrorism and to hide its own gross failings, it has become second nature for Pakistan to blame India for all its internal issues." He further stated, "This exercise in deceiving the world is doomed to fail."

ISPR did not offer any evidence of Indian involvement in the bombing. It said that "Indian proxies have been unleashed" in Balochistan and Khyber Pakhtunkhwa to spread violence. Balochistan is the most resource-rich but least populated province of Pakistan. A long-standing insurgency has existed there. Terrorist groups based there are demanding more control over natural resources and autonomy.

The bombing took place a bit more than 10 days after India and Pakistan had agreed to a ceasefire after four days of fighting using drones, missiles and long-range weapons.

India had initiated Operation Sindoor on May 7. The operation was directed against terrorist camps in Pakistan-occupied territory as a response to a terror attack in Pahalgam on April 22.