(CNN) -- At least 24 people died Wednesday in Syria, 21 of them in the city of Homs, where tanks and heavy gunfire were reported, activists said.

Dozens of others were injured in Homs, some seriously, and gunfire continued in some neighborhoods of the city late Wednesday, the London-based Syrian Observatory for Human Rights said.

All landline telephones have been cut off in Homs, according to the group.

Tanks arrived at the city center Wednesday, and heavy gunfire erupted in the neighborhoods of Khaldiya and Baba Amr, the Local Coordination Committees of Syria said.

Meanwhile, two people were killed Wednesday in the city of Sarmeen, in Idlib province, and another person in the city of Hama, the opposition group said.

CNN cannot independently verify the claims because the government has repeatedly denied requests for journalists to report inside Syria.

The attacks come a day after Syria canceled a scheduled visit by the head of the Arab League, citing unspecified "circumstances beyond our control."

COMMENT: it is very sad that the world is still in war and eery day people that havent do anything bad die because of the hands of bad people like in lybia or in sirya were theres war and like we see nothing can stop it but we have to do somethin and has to be quick.