Nato doesn't know if Gaddafi is dead or alive

"All NATO targets are military targets, which means that the targets we've been hitting are command and control bunkers," NATO spokesman Claudio Gabellini told reporters, adding "and it happened also last night in Tripoli".

"NATO is not targeting individuals," he said via videolink from the operation's headquarters in Naples, Italy.

When asked whether Gaddafi was still still alive, the Italian NATO general said: "We don't have any evidence. We don't know what Gaddafi is doing right now."

Fresh sorties by Nato warplanes struck the Libyan capital late Monday and early Tuesday in some of the heaviest bombing missions in weeks. The air strikes reportedly targeted a military base and a compound used by Gaddafi.

Nato earlier rejected claims by Libya Tuesday that the military alliance attacked the Supreme Court building in Tripoli and various civilian targets.Since the Nato mission in Libya began March 31, its jets have conducted a total of 5,968 sorties, including more than 2,300 strike missions, the