Prime Minister Imran Khan on Sunday said Pakistan could have responded to India after its missile landed in his country's Punjab province but it observed restraint.

On March 9, an unarmed Indian supersonic missile entered Pakistani territory, endangering several airliners during the course of its flight before hitting a private property (cold storage) near Mian Channu, some 275-km from Lahore. No loss of life was reported.

Speaking for the first time on the incident, Prime Minister Khan said, "We could have responded after an Indian missile fell in Mian Channu but we observed restraint."

He was addressing a public rally in Punjab's Hafizabad district on Sunday afternoon in the face of a no-confidence motion moved against him by the joint opposition.

Khan also talked about the country's defence preparedness, saying "we have to make our defence and country strong."

Earlier, Pakistan's Foreign Office on Saturday said it was not satisfied with India's "simplistic explanation" on the "accidental firing" of a missile that landed in Pakistan's Punjab province and demanded a joint probe to accurately establish the facts surrounding the incident.

"Pakistan has proposed to New Delhi a joint probe into the incident to establish facts since the missile had landed into Pakistani territory," Pakistan's Foreign Office (FO) said and asked why India failed to inform Pakistan immediately about the accidental launch' of the missile and raised questions regarding the Indian safeguards against such happenings.

"Pakistan dem ands a joint probe to accurately establish the facts surrounding the incident, the FO said.

India claimed that the missile was fired accidentally' during a routine maintenance operation because of a technical malfunction and said a high-level court of enquiry' had been ordered into the incident.

Pakistan's National Security Advisor Moeed Yusuf on Friday questioned India's ability to handle sensitive technologies and called for an investigation into its "inadvertent" launch of a missile that landed in Pakistan.

India on Friday said it accidentally fired a missile two days back that landed in Pakistan and that the "deeply regrettable" incident was caused by a technical malfunction in the course of its routine maintenance.

Yusuf said in a series of tweets that the Indian government did not bother to inform Pakistan about the incident.

"This raises serious questions about India's ability to handle such sensitive technology," he said.

He said that the missile had travelled close to the path of international and domestic airlines and threatened the safety of civilians. He also called out the Indian authorities for not informing Pakistan immediately that an "inadvertent launch of a cruise missile had taken place".

"In a nuclear environment, such callousness and ineptitude raise questions about the safety and security of Indian weapon systems," he said.

Yusuf also alluded to multiple incidents of uranium theft in India that had been reported and its citizens "have even been arrested while smuggling uranium in the recent past".