Activists say clashes between Syrian government troops and rebels are raging in the opposition bastion of Saleheddine and other districts of the besieged city of Aleppo.

The fighting comes just a day after President Bashar Assad’s regime claimed in state-run media that its forces have fully regained control of Salaheddine.

The Local Coordination Committees and the Syrian Observatory for Human Rights said Thursday’s shelling was most focused on Salaheddine, as well as a northeast district and areas in the city’s southwest.

Syria launched a ground assault Wednesday on rebel-held areas of Aleppo, the country’s largest city and key commercial hub.

The regime’s blistering attacks on rebel positions in recent weeks seem to have chipped away at the opposition’s grip on its strongholds in the city.