Syrian troops launched a ground attack in Homs on Wednesday in an apparent attempt to overrun the rebel-held Baba Amro neighbourhood that has endured 25 days of siege and fierce bombardment, opposition sources said.
The army is trying to go in with infantry from the direction of al-Bassel football field and fierce confrontations with automatic rifles and heavy machineguns are taking place there, activist Mohammad al-Homsi told Reuters from Homs.
He said the military had shelled Baba Amro heavily on Tuesday and overnight before the ground attack started.
Another opposition source said hundreds of Free Syrian Army rebels were holding out in the area, situated between Baba Amro and al-Inshaat district, which is also under army siege.
Several Western journalists are trapped in the battered district, although Syrian activists escorted British photographer Paul Conroy to safety in nearby Lebanon on Tuesday in a messy escape in which some of his rescuers were killed.
Reports from Baba Amro could not immediately be verified due to tight government restrictions on media work in Syria, where President Bashar al-Assad is struggling to repress an almost year-long uprising against his 11-year rule.
A spokesman for the International Committee of the Red Cross, Hicham Hassan, could not confirm the assault but said the violence was making the humanitarian situation more difficult.
This makes it even more important for us to repeat our call for a halt in the fighting, he told Reuters in Geneva.
It is essential that people who are in need of evacuation -- wounded people, women and children -- that we are able to offer them that with the Syrian Arab Red Crescent.
Food supplies had been delivered to Homs and Idlib on Tuesday but it was hard to distribute aid due to the conditions on the ground, he said.
Activists say hundreds of civilians have been killed in besieged opposition districts of Homs, including at least 20 on Tuesday. Shells and rockets have been crashing into Baba Amro since February 4. Army snipers pick off civilians who venture out.
Syrian troops bombarded the besieged town of Rastan, 20 km (13 miles) north of Homs, and several people were killed when a shell hit a house, the Syrian Observatory for Human Rights said.
Activists said troops and pro-Assad militiamen had also attacked the town of Helfaya, an opposition stronghold near the city of Hama, detaining people and raiding and burning houses.
Youtube footage posted by activists showed crowds of people in the nearby town of Kernaz in solidarity with Helfaya. Demonstrators danced, waved pre-Baathist era Syrian flags and chanted: God support your oppressed subjects.
Troops and militiamen launched a security sweep in the eastern Damascus suburb of Harasta, where telephone services have been cut off for the past month, activists said.
The United Nations says Assad's security forces have killed more than 7,500 civilians since the revolt began last March.
There are credible reports that the death toll now often exceeds 100 civilians a day, including many women and children, U.N. Under-Secretary-General for political affairs Lynn Pascoe told the U.N. Security Council on Tuesday. The total killed so far is certainly well over 7,500 people.
Syria's government said in December that armed terrorists had killed over 2,000 soldiers and police during the unrest.
DRAFT U.N. RESOLUTION
As world dismay grew over the bloodshed, France said the Security Council was working on a new Syria resolution and urged Russia and China not to veto it, as they have previous drafts.
An outline drafted by Washington focused on humanitarian problems to try to win Chinese and Russian support and isolate Assad, Western envoys said. But they said the draft would also suggest Assad was to blame for the crisis, a stance his longtime ally Russia in particular has opposed.
Asked by a U.S. senator whether Assad could be called a war criminal, Clinton told a Senate hearing: There would be an argument to be made that he would fit into that category. She added, however, that using such labels limits options to persuade leaders to step down from power.
Russia and China vetoed a draft resolution on February 4 that would have backed an Arab League call for Assad to step down. China indicated a possible shift late on Tuesday when it told the head of the Arab League it supported international efforts to send humanitarian aid to Syria.
But Chinese Foreign Minister Yang Jiechi also urged political dialogue in Syria, something ruled out by Assad's opponents while the bloodshed goes on, and Russia has warned against interference in Syria under a humanitarian guise.
Syria's U.N. envoy in Geneva stormed out of the U.N. Human Rights Council after saying other nations must stop inciting sectarianism and providing arms to Syrian rebels.
International efforts to halt the violence in Syria have not been helped by disunity among Assad's opponents. The Kuwaiti parliament extended its own recognition on Tuesday to the exile Syrian National Council as the representative of the Syrian people, but other groups challenge the SNC's legitimacy.
Conroy, who works for London's Sunday Times, was spirited safely out of Homs into Lebanon on Tuesday. He is in good shape and in good spirits, the newspaper said.
He had been among several journalists trapped in Baba Amro, where Marie Colvin, a veteran war correspondent also with the Sunday Times, and French photographer Remi Ochlik were killed in a bombardment on February 22. Their bodies are still there.
Confusion surrounded the fate of French freelance reporter Edith Bouvier, who was wounded in the same attack. President Nicolas Sarkozy initially said he had been informed that Bouvier had been evacuated, but later said that had not been confirmed.
Activists said Bouvier was back in Baba Amro, along with Spanish journalist Javier Espinosa and French photographer William Daniels, after a failed attempt to smuggle them out.
France's foreign ministry said it was ready to carry out an evacuation but it was waiting for the Assad government to arrange the conditions, notably an immediate ceasefire for Baba Amro.
Meanwhile Kofi Annan, the newly appointed United Nations-Arab League envoy for Syria, said he will discuss the situation with U.N. Secretary-General Ban Ki-moon and member states in New York on Wednesday. He will then go to Cairo for talks with Arab League head Nabil Elaraby.
(Additional reporting by Dominic Evans, Erika Solomon and Mariam Karouny in Beirut, Louis Charbonneau and Michelle Nichols at the United Nations and Stephanie Nebehay in Geneva; Writing by Alistair Lyon; Editing by Angus MacSwan)