(BBC NEWS) Homs – Activists say more than 40 people have died as a result of the new shelling, but this is difficult to verify.
The attacks come a day after President Bashar al-Assad promised the Russian foreign minister in Damascus that he would end violence and start dialogue.
Russia and China blocked a UN Security Council resolution last week.
The BBC’s Paul Wood, who is now on the outskirts of Homs with rebel fighters, says that his contacts inside the city describe the impacts as falling constantly – and it it too dangerous for them to go out and investigate the number of dead and injured.