SYRIA'S military pursued a crackdown on rebels on several fronts yesterday, days after eliminating an opposition bastion in the central city of Homs following a 26-day siege, activists said.

Troops kept the Red Cross out of the wrecked Homs district of Baba Amr for a fourth day and foreign mediators sought to end year-long violence as more civilians fled to nearby Lebanon.

Braving army patrols and winter weather, hundreds of Syrians crossed into Lebanon in the past 24 hours to escape the heaviest shelling of their border towns since the uprising against President Bashar al-Assad began last March.

In the town of Arsal in Lebanon, residents said 100 to 150 families arrived from Syria on Sunday – one of the biggest refugee influxes so far. Families trekked through snow-capped hills to safety, but many others were caught, one refugee said.

Syria has so far brushed off international pressure to halt its violent response to the uprising.

The UN-Arab League special envoy to Syria, Kofi Annan, will travel to Damascus on Saturday for what would be his first visit since he was appointed to the post last month.

The state news agency SANA said the Government welcomed his visit and had accepted one by UN humanitarian chief Valerie Amos, who was denied entry to Syria last week.