Russian satellites fail to enter orbit after launch
Russian aerospace experts said the satellites and the upper stage rocket carrying them probably fell into the Pacific Ocean near Hawaii.
Officials said the satellites went off course after separating with a booster rocket from the main launch rocket.
The satellites were to be part of a navigation system meant to rival GPS.
They were being carried on a Proton-M rocket launched earlier on Sunday.
A source in Russia's aerospace industry told Ria-Novosti news agency that the rocket had veered off course by eight degrees after its launch.
Russia has already successfully launched a number of the Glonass satellites this year. The navigation system is meant to be in place next year.