A senior UN official has told the Security Council that Syria accelerated its killing of pro-democracy demonstrators after Arab League monitors arrived, according to Susan Rice, the US ambassador to the UN.

"The under-secretary-general noted that in the days since the Arab League monitoring mission has been on the ground, in fact an estimated 400 additional people have been killed, an average of 40 a day, a rate much higher than was the case even before their deployment," Rice told reporters on Tuesday.

Rice was speaking after Lynn Pascoe, the UN under-secretary-general for political affairs, briefed the 15-nation Security Council behind closed doors on Syria and other major crises. She said the figure did not include the more than two dozen people killed in a suicide bombing in Damascus last week.

"That is a clear indication that the government of Syria, rather than using the opportunity ... to end the violence and fulfill all of its commitments (to the Arab League), is instead stepping up the violence," Rice said.

Bashar Jaafari, Syria's UN ambassador, rejected Rice's allegations, saying the violence in the country was caused by "terrorists" and "armed groups" that were receiving support from foreign countries.


Arab League observer, Anwar Malek, on why the mission is a failure

Earlier on Tuesday Syrian President Bashar al-Assad vowed to strike "terrorists" with an iron fist and derided Arab League efforts to halt violence in a 10-month-old revolt against his rule.

In a rare televised speech, Assad accused the Arab League of hypocrisy for lecturing Syria on democracy and reform. However, he said his country would not "close the doors" to an Arab-brokered solution to the crisis as long as it respected Syria's sovereignty.

Assad also said he had not ordered anyone to open fire on anti-government protesters. However, opposition activists said at least 28 people were killed across the country on Tuesday alone as part of the government's ongoing security crackdown.

Assad asked what right other Arab governments, including the absolute monarchies of the Gulf, had to lecture Syria about democracy or reform.

"The first parliament in Syria was in 1917. Where were they then?" he said. "Their situation is like a doctor who smokes and recommends to his patient to give up smoking while he, the doctor, has a cigarette in his mouth."

The Arab League suspended Syria and sent a team of monitors in late December to assess whether the government was abiding by a peace plan agreed to by Assad last month.

Assad said the unrest had inflicted a "heavy cost" and accused "foreign conspirators" of working to destabilise the country and said it had been his idea for observers to visit Syria "to find out the truth".

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He also said he would not step down, claiming he still had the Syrian people's support, despite months of anti-government protests across the country against his rule.

"When I leave office it will be by the will of the people," he said.

Opposition reacts

Reacting to Assad's speech, the Syrian National Council (SNC), the largest opposition umbrella group, called it an "incitement to violence" indicating "more criminal behaviour" by the government.

"There is incitement to violence, incitement to civil strife, some talks about sectarian divisions which the regime itself has fomented and encouraged," Basma Qadmani, an SNC member, said in the Turkish city of Istanbul.

"Our concern today is that such a speech is quite indicative of the total dismissal by the regime of the international community.

"And that is an indication that we are going in the direction of more irresponsible and more criminal behaviour by the regime in the coming days and weeks."


Journalist Nir Rosen discusses the situation in Syria

Qadmani also said Assad's speech indicated that the government was breaking away from the Arab League".

"This is a turning point, a rupture with its Arab environment," she said.

Assad, who has made repeated promises of reforms, said a new constitution would soon be put to a referendum, with a vote possible by March, followed by multi-party parliamentary elections within months.

"After legislation has been drawn up and a constitution... we will call a referendum... [maybe] in the first week of March." he said. "Elections must be linked to a new constitution. They could be at the start of May."

Assad urged Syrians to remain steadfast, telling them that "victory is near" and that outside forces had been unable to "find a foothold in the revolution that they had hoped for".

He also pledged to hit back at so-called terrorists following a pair of deadly bombings in Damascus and spreading violence blamed on anti-government forces.

"There can be no let-up for terrorism - it must be hit with an iron fist," Assad said. "The battle with terrorism is a battle for everyone, a national battle, not only the government's battle."

Not 'totally uncompromising'

Speaking to Al Jazeera, Patrick Seale, author of several books on Syria, said that while Assad's speech was tough, it was not "totally uncompromising".

"He spoke of a new constitution, and putting it to a referendum, fresh elections, and that a new government would be formed," Seale said.

"I would say that he remains very much in control. I wouldn't say he was frightened, because the opposition is not in a position to topple him."

Seale said that there was still a slice of the population who seemed to favour Assad. "It is not as if the whole country is against him," he said. "The opposition, as brave as it is, hasn't come up with a clear project or a clear leader.

"The problems are how to stop the killings, and how are the Syrians going to be able to live together after this blood-letting."

Source: Al Jazeera and agencies