Syrian troops has launched an offensive on several rebel-held parts Homs city on Saturday, an NGO said, pounding the districts with air raids and mortar fire.
"War planes carried out two consecutive raids against areas under siege in Homs city, as well as carrying out heavy shelling against the same districts," the Syrian Observatory for Human Rights said, according to AFP news agency.
"The shelling is focused on the neighbourhoods of Khaldiyeh, Bab Hud, Hamidiyeh and Bustan al-Diwan in an unprecedented manner."
The group said regime forces were using mortar shells, rockets, tank shells and heavy artillery in the assault.
Videos uploaded on the Internet showed heavy explosions and clouds of white smoke that were, according to activists, as a result of the strikes that took place on Saturday.