New amateur video from Homs in Syria purportedly shows the shelling of buildings in the Baba Amr district.
Activists say government troops and tanks have pulverised the city in recent days, killing at least 30 people on Monday alone.
Arab League peace monitors will, today, try to see the situation for themselves.
The first 50 monitors arrived on Monday to determine whether the government of President Bashar al Assad is abiding by a peace plan by withdrawing troops from cities.
“We asked them why they aren’t going to the centre of Bab el-hawa,” said Burhan Ghalioun, leader of the National Syrian Council.
“They told us they don’t have the vehicles or other logistics needed to go to Bab el-hawa. They are being held prisoners by the Syrian system,” he added.
Syria’s top opposition leader called on the Arab League to bring the United Nations into the effort to stop the violence plaguing the country.
Fighting in Homs has intensified since a double suicide bombing in Damascus on Friday that killed 44 people.