NATO aircraft continued to bomb the Libyan capital of Tripoli on Tuesday in a rare daytime strike on the city.
Alliance airstrikes began just before midday and reportedly hit compounds where pro-Gaddafi fighters are based
There was no immediate information on the number of casualties.
Rebel forces have taken control of some parts of western Libya over the past few weeks but Colonel Muammar Gaddafi retains his grip on Tripoli.
As military efforts intensify, Russia’s envoy to Africa, Mikhail Margelov, visited the rebel stronghold of Benghazi for talks with the opposition National Council.
In March, Russia abstained from the UN vote authorising the NATO mission but has now joined the West in calling on Gaddafi to go.
Moscow enjoyed close relations with the Libyan regime before the bombing began.