Saturday, April 10, 1999 Published at 22:28 GMT 23:28 UK
Nato 'tightening the screw'
The additional military support does not include ground troops
The US has said that more than 80 planes are to be sent to boost existing Nato forces in the air strikes against Yugoslavia.
The Ministry of Defence said sending Invincible was part of 'tightening the screw' on the Serbs
The announcements came as air raid sirens sounded in the Serbian capital Belgrade, hours before the country marks one of its main religious festivals, Orthodox Easter Sunday.
Among the additional hardware, the US is committing:
But there was no word from Washington on whether ground troops will be sent in.
Bad weather delays Apaches
In the briefing, US officials acknowledged that it could be several weeks before 24 Apache attack helicopters can be deployed against the Serbian forces.
Introduction of the Apaches will allow close-to-the-ground strikes against Serb troops and tanks during persistent bad weather.
Nato said that it had to cancel a third of its attacks as a result of heavy cloud cover on Friday night.
Explosions were also reported in Belgrade and around the towns of Novi Sad, Nis, Cacak and Bor.
Meanwhile, Serb forces and KLA guerilla fighters have exchanged fire near the Albanian border, according to an OSCE spokesman.
Four KLA fighters were reported killed and two wounded in a battle on Friday, around 300km north of Tirana.
Western leaders have stepped up efforts to involve Russia in a diplomatic solution to the Kosovo crisis.
The German foreign minister, Joschka Fischer, said he was trying to arrange an emergency ministerial meeting of the eight leading industrial nations, the G8, to involve Russia as a mediator in the crisis.
The move comes one day after President Yeltsin raised the possibility of Russian military involvement in the conflict in Yugoslavia.
The UK and the US have reportedly since received assurances from Moscow that Russia had no such intention.
Ethnic cleansing fears
International monitors say between 3,000 and 5,000 people are being forced across the border in the second wave of forced expulsions since Friday.
And hundreds of refugees have been arriving in Macedonia, although at one crossing point, the Yugoslav authorities turned back a line of vehicles that eyewitnesses said stretched for miles.
Although the United Natiuons High Comissioner for Refugees has urged that refugees be kept in the region if possible, more than 700 were flown from Macedonia to Germany and Poland on Saturday.
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