Israeli officials are ramping up accusations that Iran was launching covert attack plots, saying "sticky" bombs found in a Thai house rented by Iranians were similar to devices used against Israeli diplomats in India and Georgia.

Investigators in Italy still had no firm clue of who was behind a bomb attack at a school, which killed one 16-year-old student, a day after a device made up of gas cylinders exploded outside a mainly all-girls vocational school in Brindisi.

A United Nations telecom meeting has approved the next generation of mobile technology, which experts say will make devices 500 times faster than 3G smartphones.