India said on Friday it had accidentally fired a missile into Pakistan this week because of a “technical malfunction” during routine maintenance.

Military experts have in the past warned of the risk of accidents or miscalculations by the nuclear-armed neighbours, which have fought three wars and engaged in numerous smaller armed clashes, usually over the disputed territory of Kashmir, Reuters reported.

Tensions have eased in recent months, and the incident, which may have been the first of its kind, immediately raised questions about safety mechanisms.

“On 9 March 2022, in the course of a routine maintenance, a technical malfunction led to the accidental firing of a missile,” the Indian Ministry of Defence said in a three-paragraph statement.

“It is learnt that the missile landed in an area of Pakistan. While the incident is deeply regrettable, it is also a matter of relief that there has been no loss of life due to the accident.”

The ministry said the government had “taken a serious view and ordered a high-level Court of Enquiry”.

Pakistani officials said the missile was unarmed and had crashed near the country’s eastern city of Mian Channu, about 500 km from capital Islamabad, Reuters reported.

Pakistan’s foreign office summoned India’s charge d’affaires in Islamabad to lodge a protest over what it called an unprovoked violation of its airspace, saying the incident could have endangered passenger flights and civilian lives.

Pakistan warned India “to be mindful of the unpleasant consequences of such negligence and take effective measures to avoid the recurrence of such violations in future”.

Following India’s admission, Pakistan’s National Security Advisor Moeed Yusuf said it was “highly irresponsible” of New Delhi not to inform Islamabad immediately of the inadvertent launch of a missile.

“The real circumstances surrounding this incident must also be investigated to ascertain if this was an inadvertent launch or something more intentional,” Yusuf said on Twitter.

One senior Pakistani security official told Reuters, on condition of anonymity, that the incident had raised alarm and could have escalated into a “critical untoward situation”.

“The admission that it was a missile was very nonchalant,” he said. “What does this say about their safety mechanisms and the technical prowess of very dangerous weapons? The international community needs to have a very close look at this.”

The official said it was possibly a BrahMos missile – a nuclear-capable, land-attack cruise missile jointly developed by Russia and India.

According to the U.S.-based Arms Control Association, the missile’s range is between 300 km and 500 km, making it capable of hitting Islamabad from a northern Indian launch pad.

The Pakistani official wondered if the incident meant that India had “missiles in ready-to-launch positions and pointed at Pakistan, and that too without any safeguard of a command and control system”.

A Pakistani military spokesman told a news conference on Thursday evening that a “high-speed flying object” originating from the northern Indian city of Sirsa had crashed in eastern Pakistan.