"Loyalist forces backed by fighters from Hezbollah have advanced over the last 24 hours and now control 50 per cent of Khaldiyeh," the Syrian Observatory for Human Rights said.
Its chief Rami Abdel Rahman told AFP today that overnight, "there was continuous heavy mortar and artillery fire" and that the rebel district was still being pounded.
He said rebels were putting up "fierce resistance" amid "very intense clashes".
Militant network the Syrian Revolution General Commission also reported heavy fighting in the district that has been besieged by regime forces for more than a year.
It and the Observatory both said the Old City district of Homs -- dubbed the "capital of the revolution" against President Bashar al-Assad -- was being pummelled too.
The latest regime offensive on besieged rebel-held neighbourhoods of Homs is now in its fourth week.
Government forces are seeking to secure another victory like the one in Qusayr near the border with Lebanon in June, when Hezbollah was key in retaking the strategic town.
