Perpetrators

Both the Jamat ul-Ahrar and the Islamic State's Khorasan Province claimed responsibility for the attack. Initially, Islamic State – Khorasan Province claimed the responsibility for the attack stating that "A martyr from the Islamic State detonated his explosive belt at a gathering of justice ministry employees and Pakistani policemen in the city of Quetta".^[5][26][27] However, Jamaat-ul-Ahrar, a splinter group of the Pakistani militant group Tehrik-i-Taliban Pakistan, also claimed credit for the attack on advocate Kasi and the hospital.^[3][28][29] The group threatened that more attacks would take place "until the imposition of an Islamic system in Pakistan".^[23]

ISPR quoted Army Chief Raheel Sharif as saying that the attack was targeting China-Pakistan Economic Corridor (CPEC).^[30]

Domestic

Prime Minister Nawaz Sharif and President Mamnoon Hussain condemned the attack and expressed their grief over the loss. The government announced three-day mourning in which the National Flag of Pakistan will remain at half staff on government buildings.

Consequent to the attack, a scheduled meeting was held to review the implementation of the National Action Plan and it was decided that a task force consisting of senior officials from the security agencies of both the federal and provincial governments, will be established to monitor the progress. Several politicians, including Balochistan Chief Minister Sanaullah Zehri, Interior Minister Sarfraz Bugti, former president Pervez Musharraf, National Security adviser Sartaj Aziz, Pakistan Foreign Ministry spokesman Nafees Zakaria accused the Indian intelligence agency Research and Analysis Wing (RAW) and Afghanistan's intelligence agency National Directorate of Security (NDS) of orchestrating the attack. The accusations reiterated past Pakistani claims of Indian involvement in Balochistan.^{[31][32][33][34][35][36][37]} Pakistan's military establishment said that the threat to internal security was morphing due to a nexus between hostile foreign intelligence agencies and local militant groups.^[38]

However, Pakhtunkhwa Milli Awami Party (PkMAP) chief Mahmood Khan Achakzai, Jamiat Ulema-e-Islam (F) Chief Maulana Fazlur Rehman and Muhammad Khan Sherani and Leader of opposition in Pakistani Senate, Chaudhry Aitzaz Ahsan alleged that the government was trying to save itself from any responsibility by blaming foreign agencies and contending that it was a failure of Pakistani Intelligence Agencies demanded sacking of officials if perpetrators are not caught.^{[39][40][41][42][43][44][45][46]}

The provincial government announced a compensation of Rs 10 million for the deceased person's family and Rs 5 million for seriously injured. Medical expenses and associated charges of those admitted to Combined Military Hospital (CMH), Quetta and Aga Khan University Hospital, Karachi will be compensated by Government. According to the victim's Government is not doing enough for their care. Punjab chief minister, Shahbaz Sharif, gave Rs 0.5 Million to the deceased and Rs 250,000 to the injured. Education Fund was established by Balochistan Chief Minister Nawab Sanaullah Zehri for the children of the victims.^[18]

International

United Nations Secretary General Ban Ki-moon,^[47][48] United States White House Press Secretary Josh Earnest^[49] Afghan President Ashraf Ghani^[50] and French President François Hollande all condemned the attack.^[51] The Pakistan and England cricket teams observed a minute of silence before the start of their fourth test match. Both teams wore black armbands in solidarity with the victims.^[52]

Social networking website Facebook activated its Safety Check feature enabling people to mark themselves as safe.^[53]