United Nations: A UN investigator called on the world body on Friday to set up a panel to study the ethics and legality of unmanned military weapons — an apparent reference to US drones that strike suspected militants.

In a report to the UN General Assembly human rights committee, Christof Heyns said such systems raised "serious concerns that have been almost entirely unexamined by human rights or humanitarian actors".

"The international community urgently needs to address the legal, political, ethical and moral implications of the development of lethal robotic technologies," said Heyns, UN special rapporteur on extrajudicial executions.

Playstation mentality

It was the second time this year UN experts tackled the issue. In June, Heyns' predecessor, Philip Alston, called for a halt to CIA-directed drone strikes on Al Qaida and Taliban suspects in Afghanistan and Pakistan, saying killings ordered far from the battlefield could lead to a "Playstation" mentality.

The CIA contested Alston's findings, saying — without confirming it carried out the strikes — that its operations "unfold within a framework of law and close government oversight."

But Heyns, a South African law professor, said there was a need to discuss responsibility for civilian casualties, how to ensure the use of robots complied with humanitarian law, and standards for developing the technology involved.

Saying the UN should take a lead, he urged Secretary-General Ban Ki-moon to convene a group of national representatives, human rights experts, philosophers, scientists and developers to promote a debate on the legal and moral implications of robotic weapons.