More than 90 people were killed, the opposition Local Coordination Committees of Syria said. The death toll could rise, the activist group said.
An activist who oversaw the burial of many bodies said at least 109 people died.
Hassan Al-Rajb told CNN that 69 people were identified and buried, while 15 others were laid to rest without being ID'd. At least 25 more bodies were still at the site, but hospital workers said the roads were cut off and they were unable to reach the bakery, he said. The hospitals cannot handle all the wounded, he said.
An LCC activist told CNN he went to the scene.
"There were dozens of dead thrown in the street. The residents were shocked and in a state of fear. It was chaotic," Mahmoud Alawy said.
Videos posted on social media purported to show the aftermath of the attack. Many bodies had limbs apparently blown off, and others lay bloody in the streets and in rubble strewn over a sidewalk. Uniformed Free Syrian Army soldiers and civilians scramble to pull survivors out of the carnage.