Nato officials say more than 650 missions were flown during Saturday and overnight.

In Kosovo itself, Nato aircraft attacked armoured vehicles, artillery positions, tanks and other military vehicles.

Three parked aircraft, two surface-to-air missile transporters and a radar site were also among the targets as well as ammunition and petroleum storage sites.

Nato also attacked what it described as a special police depot in Belgrade, and the electrical transformer yard at Obrenovac.

New arrivals: American F-18 fighters join the Nato force

The alliance force in the region continues to grow. The United States is sending 27 more F-18 fighters from their base in North Carolina.

Three F-18s arrived at Taszar airbase in southern Hundary on Saturday.

(Click here to see a map of the most recent Nato strikes)

KLA urge Nato to press on

The Kosovo Liberation Army has urged Nato to press on with its intensified bombing campaign, despite the accidental attack by Nato planes on a KLA base inside Kosovo.

The base, on a hilltop near the Albanian border, was seized by the KLA from the Yugoslav Army a month ago.

The Nato spokesman, Jamie Shea, said: "If we had known that it had been captured by the KLA, it would have been taken off the target list".

Debate over ground troops goes on

Commenting on the possible deployment of ground troops, Nato officials said on Sunday that the priority is to prepare for a much larger peace implementation force than originally envisaged - possibly some 48,000 troops.

In theory, that force would go into Kosovo if and when Nato demands are met. Alliance ambassadors are expected to approve the plan in a few days.

Britain has been in the forefront of calls for Nato to look more closely at other ground troop options, should air strikes not deliver the desired results in time. On that issue, correspondents say there clearly is no consensus at the moment.

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