richard reports tonight from ariha about 40 miles outside the big city of aleppo. >> reporter: 11:00 a.m. attack helicopters circle the sky. from a roof top we hear the assault begin. it sounds like artillery and tracings from the helicopters. we move down to the alley to try to find out why syrian forces are attacking this city of 70,000 south of aleppo. we see civilians fleeing from open areas searching for cover and rebels on motor cycles on the main square. it appears a large military convoy was passing through and as the troops were moving past here the rebels in this town opened fire on them. in a makeshift rebel media center activists try to upload videos of the attack they have taken with small cameras. they show me syrian tanks are now firing. the rebels attack the convoy to prevent reinforcements from reaching aleppo but now this city is paying for it. back in the alleys men on motorcycles tell us there are bodies up the street, many. in a mosque, we find them along with their distraught relatives. witnesses say the victims were civilians standing outside a mosque and attac