Syrian government forces on Thursday tightened their siege of the dissident central province of Homs, a day after killing more than 100 people in heavy shelling, opposition activists said.

Activists reported that at least 31 people died on Thursday as Assad’s forces continued the attack.

"Most of the deaths occurred in the neighborhoods of Khalidiyeh and Baba Amr," the opposition Local Coordination Committees said in a statement.

"More than 1,000 troopers backed by dozens of tanks are now positioned on the outskirts of Homs," Omar Homsi, an activist based in the area, said by satellite phone.

He said the shelling continued Thursday on the districts of Baba Amr, al-Bayyada and al-Khalidiyeh in Homs, killing at least five people.

"This signals preparations for a major onslaught on the areas where activists and defectors are based," Homsi said.

The Syrian opposition has called for Arab and Western countries to intervene to immediately stop attacks on residential areas.

On Wednesday, UN Secretary General Ban Ki-moon said Arab League head Nabil al-Arabi had informed him that the pan-Arab organization planned to send a monitoring mission back to Syria and asked for UN help.

The Arab League suspended its monitoring mission to Syria on January 28 because of rising violence.

Read this article in Hebrew