The Minister for Foreign Affairs, Brian Cowen, said security at Shannon airport will be stepped up following this morning's attack on a US military aircraft.

Mary Kelly, 50, appeared at Killaloe District Court this afternoon charged with causing damage to the US Navy plane.

She was initially remanded in custody with consent to bail on her own surety of €5,000; however she refused to sign the bail bond and was remanded in custody to appear at Tulla District Court on Wednesday next.

Earlier, the Taoiseach has said that the Government will reconsider the use of Shannon airport by US troops if there is unilateral action against Iraq without a United Nations mandate.

Mr Ahern told the Dáil that until then, the traditional arrangements for refuelling at Shannon would remain in place.

He added that if there was unilateral action, the matter would be referred to the Dáil and the Government would make a decision on it.

Greens walk out of Dáil

Earlier this afternoon all of the Green Party's TDs walked out of the Dáil during Taoiseach's question time, after displaying a 'No to War' banner.

Mr Ahern had just begun to answer a question about the use of Shannon airport by US troops, when the Green TDs raised their banner, contrary to Dáil rules.

They were led out by party leader Trevor Sargent.

On RTÉ Radio earlier today, the Minister for Transport, Seamus Brennan said it had been Government policy for decades to allow military aircraft from many nations to refuel at Shannon.

He said the Government would review the situation if the United States took unilateral military action against Iraq.