India's move targeting Pakistan following a shooting incident in Indian-controlled Kashmir was "highly irresponsible and legally unfounded," and Pakistan will adopt a series of countermeasures, the Prime Minister's Office said in a statement on Thursday.

Pakistani Prime Minister Shehbaz Sharif chaired a high-level meeting of the National Security Committee on Thursday, according to the statement. The committee expressed concern over the loss of tourists' lives in the incident and reaffirmed that Pakistan unequivocally condemns all forms of terrorism.

In the absence of any credible investigation and verifiable evidence, India's attempts to link the attack to Pakistan are "reckless, irrational and illogical," the statement said.

In response, Pakistan will close the Wagah Border Post, suspend certain visa facilities for Indian nationals, declare the Indian Defense, Naval and Air Advisors in Islamabad persona non grata, close its airspace to all Indian airlines, and suspend all trade activities with India, the statement said.

Indian media reported that at least 25 people were killed and several others injured on Tuesday after unknown gunmen opened fire in Indian-controlled Kashmir.

India has accused Pakistan of involvement in the attack.

On Wednesday, the Indian government announced a number of measures against Pakistan, including the suspension of the Indus Waters Treaty, closure of the border and expulsion of Pakistani personnel.

India's Ministry of External Affairs announced on Thursday it would suspend all categories of visas for Pakistani nationals effective immediately, and advised Indian citizens against traveling to Pakistan, according to Indian media.