VIENNA - Two Syrian intelligence officers gave more evidence in Vienna Monday to the UN commission investigating the murder last year of Lebanon's former prime minister Rafiq Hariri, a Syrian diplomat said.

They were Syria's former head of intelligence in Lebanon, Rustom Ghazale, and his deputy, retired colonel Samih Kashaami, both of whom were heard by the commission in December, Syria's ambassador in Austria, Safwan Ghanem, told AFP.

Ghanem added that this latest round of hearings was over.

In the Austrian capital last month the hearings had involved three other Syrians: Abdelkarim Abbas, head of intelligence in Palestine, Zaher Yussef, head of communications and Jameh Jameh, another of Ghazale's deputies.

The commission, led since last week by Belgian prosecutor Serge Brammertz, who was not present Monday, also wants to speak to Syrian President Bashar Al-Assad and Foreign Minister Farouk Al-Shareh.

On Saturday, a senior US diplomat warned that Syria risked further United Nations Security Council action unless it stepped up cooperation with the investigation, which drew an angry response from Damascus.

"Syria must cease obstructing the investigation into the assassination of Prime Minister Rafiq Hariri and must cooperate unconditionally" with the UN probe, said David Welch, the US pointman for the Middle East.

"The United States calls upon the Syrian regime to respond positively to the requests... If Syrian obstruction continues we will not hesitate to refer this matter back to the Security Council."

Last month, the UN Security Council passed a resolution endorsing a six-month extension of the murder probe and renewing its call for Syria's full cooperation with the investigation.

"The declarations of Mr Welch are a new attempt aimed at increasing the morale of anti-Syrian forces who are opposed to the stability of Lebanon," said a Syrian official, quoted by the state news agency Sana.

"The objective of such declarations is to increase the pressure on Syria which is calling for stability and global peace."

Welch's call echoed similar comments by US Secretary of State Condoleezza Rice earlier last week, who said Washington intends "to refer this matter back to the Security Council if Syrian obstruction continues."

Two preliminary reports by the commission's first chairman, German judge Detlev Mehlis, implicated Syrian and Lebanese intelligence officers and cast doubt on Syria's cooperation with the UN probe.

Last week, a Syrian, Ibrahim Michel Jarjoura, was arrested for giving false evidence to the inquiry, bringing to 12 the number of people detained in connection with Hariri's assassination in Beirut in a car bombing on February 14, 2005.

Among those arrested were four Lebanese generals who were key players in Syria's security system in Lebanon.

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