In a surprise development, Pakistan Muslim League-Nawaz on Tuesday nominated its president Shehbaz Sharif as the prime ministerial candidate of Pakistan instead of the party supremo and three-time former premier Nawaz Sharif.

The three main political parties in Pakistan on Sunday intensified their efforts for the formation of a coalition government after it became clear that the coup-prone country faced a hung Parliament after general elections marred by allegations of rigging.

Islamabad also summoned the Iranian charge d'affaires here and issued a strongly worded condemnation of Iran's "violation of its airspace", the Foreign Office said.

Khan was convicted in the Toshakhana case which was filed last year on the complaint of the Election Commission of Pakistan (ECP) which had earlier disqualified him in the same case.

The change of government in Pakistan after the exit of hawkish Imran Khan and his likely replacement by hard-core realist Shehbaz Sharif may provide a little window of opportunity for the leaders of India and Pakistan to reset their nearly frozen bilateral ties, according to experts.

The Sindh province is the worst-hit with 172 cases, followed by 15 in Khyber Pakhtunkhwa, 10 in Balochistan, 8 in Punjab, 5 in Gilgit-Baltistan and 2 in Islamabad, officials said.

Earlier, Pakistani military spokesperson Major General Asif Ghafoor claimed that two Indian Air Force pilots were arrested. One pilot is injured and has been shifted to a hospital, while another one is unhurt, the spokesman had said.

The country's top security body "concluded that India has committed uncalled for aggression to which Pakistan shall respond at the time and place of its choosing," it added.

Bibi was convicted in 2010 after being accused of insulting Islam in a row with her neighbours. She always maintained her innocence, but has spent most of the past eight years in solitary confinement.

This will be the fifth time that Prime Minister Sharif will pick the top commander of the country's nearly 550,000 ground troops.