MONTREAL, Canada - A United Nations agency has launched an effort to craft global guidance for the use of laptops and other portable electronics in passenger aircraft cabins after selective bans by the United States and the United Kingdom upset airline passengers as well as Middle Eastern carriers.

The International Civil Aviation Organization met on Tuesday to debate the issue after the United Arab Emirates, Egypt and other countries complained their airlines had been unduly penalized by the decision to relegate laptops to the cargo hold on some flights due to security concerns, three sources familiar with the matter said.

But while ICAO aims to come up with global recommendations to counter the risk from hidden explosives in laptops, the agency cannot override or prevent national measures such as the US and UK bans, said one of the aviation industry sources.

In March, the US announced laptop restrictions on flights originating from 10 airports in countries including the UAE, Qatar and Turkey. Britain quickly followed suit with restrictions on a slightly different set of routes.

An ICAO working paper threw its weight behind concerns that laptops are a greater security risk in the passenger cabin than in the hold, because of the threat that hidden explosives could be detonated manually.

But it has also asked its experts to weigh this against the safety risk of storing a larger number of flammable batteries unattended in a commercial aircraft's baggage compartment.

European regulators have warned placing what could be hundreds of devices in the hold on long-haul flights could compromise safety by increasing the risk of fire from poorly deactivated lithium-ion batteries.

Patrick Ky, head of the European Aviation Safety Agency, said the agency wants airlines to be careful about how they store laptops by avoiding placing them in a single container, for example.

"Should we go further? I don't think so for the time being. But in case we have a fire risk that we think is high, then of course we would take the necessary actions," Ky said.

ICAO's security panel was expected to make recommendations by mid-June, an ICAO spokesman said.

ICAO does not impose binding rules, but wields clout through safety standards that are usually followed by its 191-member countries.

Reuters - Xinhua