BEIRUT, Oct 23: A senior US official called on Saturday for action from Syria to prove it was changing its attitude regarding Lebanon, Iraq and its alleged support of terrorism, warning of further sanctions if no change was forthcoming.

"There are many issues that raise concern about Syria's attitude towards Lebanon, Iraq and terrorism," US Deputy Assistant Secretary of State David Satterfield was quoted as telling Lebanon's leading Arabic language An-Nahar newspaper.

"We want to see Syria take concrete measures because words are not enough."

The tough comments follow stringent criticism by Washington last week that Lebanon's new prime minister-designate was an inappropriate choice owing to his strong links with Syria.

The United States had in May imposed economic sanctions on Syria for its alleged support of terrorism, purported efforts to obtain mass destruction weapons and failing to crack down on infiltration of insurgents into Iraq.

Damascus has rejected the charges.

"The American president has available a number of measures he could take and which would have an effect on the United States' economic, financial and commercial relations with Syria," Mr Satterfield warned.

"The United States is extremely worried by the current situation in Lebanon because of Syrian interference," he added.

The UN Security Council in September passed a resolution demanding that Damascus pull its estimated 15,000 troops out of Lebanon and end what it saw as meddling in the affairs of its neighbour.

The 15-member UN Security Council issued a further statement on Tuesday calling again on Damascus to comply with the resolution, a call rejected outright by Syria and Lebanon as "interference".

"Lebanon and its political leaders must make their decisions in freedom, far from external interference or threats," Mr Satterfield said, adding that a recent US Congress proposal to freeze the assets of Lebanese officials who support Syria's domination of its small neighbour "reflects the profound concern of Congress and the American government".

Lebanon's prime minister Rafiq Hariri resigned on Wednesday, with his pro-Damascus arch-foe Omar Karameh almost immediately called upon to form a new government, a move sharply criticised by Washington.

Mr Satterfield also warned that the Security Council did not have to wait for UN secretary-general Kofi Annan to present his six-monthly report on the implementation of the resolution to take action.

"The Security Council will continue to monitor the situation in Lebanon and measures taken by Syria ... and we will look at what measures to take with other Security Council members."

Meanwhile, Washington's ambassador to Beirut said Saturday that the US would lift customs exemptions on Lebanese goods if the country failed to improve its record on copyright violations.-AFP