Pakistan said that before its offensive India had fired missiles at three air bases, including one close to the capital, Islamabad, but Pakistani air defences intercepted most of them.

Locked in a longstanding dispute over Kashmir, the two countries have engaged in daily clashes since Wednesday when India launched strikes inside Pakistan on what it called "terrorist infrastructure". Pakistan vowed to retaliate.

"BrahMos storage site has been taken out in general area Beas," Pakistan's military said in a message to journalists, adding that the Pathankot airfield in India's western Punjab state and Udhampur Air Force Station in Indian Kashmir were also hit.

India's defence and foreign ministries did not immediately respond to a request for comment outside regular business hours. India's military was expected to brief the media shortly, the ministry of defence said in an advisory to the media.

Pakistan's information minister said in a post on social media site X that the military operation was named "Operation Bunyanun Marsoos". The term is taken from the Koran and means a firm, united structure.

Pakistan's planning minister said on local television that "special measures" had been taken to avoid civilian targets and that they were targeting locations that had been used to target Pakistan.

Pakistan's military said the prime minister had called a meeting of the National Command Authority, a top body of civilian and military officials, which oversees decisions on its nuclear arsenal.

Sounds of explosions were reported in India's Srinagar and Jammu, where sirens were sounded, a Reuters witness said.

"India through its planes launched air-to-surface missiles ... Nur Khan base, Mureed base and Shorkot base were made targets," Pakistan military spokesman Lieutenant General Ahmed Sharif Chaudhry said in a late-night televised statement.

The chief minister of Indian Kashmir Omar Abdullah said in a statement a local administration official had been killed by shelling in Rajouri, near the line of control that divides the contested region.

One of the three air bases that Pakistan said were targeted by India is in the garrison city of Rawalpindi, just outside the capital Islamabad. The other two are in Pakistan's eastern province of Punjab, which borders India.

The Pakistani military spokesman said only a few missiles made it past air defences, and those did not hit any "air assets", according to initial damage assessments.

India has said its strikes on Wednesday, which started the clashes between the countries, were in retaliation for a deadly attack on Hindu tourists in Indian Kashmir last month.

Pakistan denied India's accusations that it was involved in the tourist attack. Since Wednesday, the two countries have exchanged cross-border fire and shelling, and sent drones and missiles into each other's airspace.

Much of the fighting on Friday was in Indian Kashmir and states bordering Pakistan. India said it shot down Pakistani drones.

The Group of Seven countries on Friday urged maximum restraint from both India and Pakistan and called on them to engage in direct dialogue. The United Kingdom's High Commissioner to Pakistan, Jane Marriott, said in a statement on social media platform X that they were monitoring the developments closely.

Sounds of explosions were also heard in the eastern Pakistani city of Lahore and the northwestern city of Peshawar, as the fighting threatened to spread.

At least 48 people have been killed since Wednesday, according to casualty estimates on both sides of the border that have not been independently verified.