Undeterred by their Wednesday shelling that killed U.S. and French journalists in a rebel stronghold in Homs, the Syrian regime sent tanks into the same district Thursday. "Tanks have entered the Jobar area in the south of Baba Amr," an activist told Reuters. President Bashar al-Assad has been intensifying his forces' siege of the city, which has killed hundreds so far in the 20 days since it began. Opposition members in Homs sounded the alarm beyond Syria's borders Thursday, saying they were running dangerously low on food and medical supplies. The Red Cross has asked for a two-hour daily ceasefire so it can get aid to victims, and the U.S. was set to meet in London Thursday with the group Friends of Syria to consider how it can assist with humanitarian aims, too.