The ongoing military campaign between pro-government forces and rebels in northern Syria left at least 11 children were among 23 people dead.
The pro-government forces continued their campaign against opposition in the country's north, while rebels shelled a government-held district in Aleppo city.
At least eight more people were killed in a suspected airstrike on a crossing point connecting Kurdish-held areas with rebel areas in northern Aleppo province, the Kurdish security force said.
The violence yesterday comes a day after government troops repelled a rebel offensive on western parts of Aleppo city launched in late October. State news agency SANA said the shelling of a western Aleppo district killed four people,including two women and a child.
The government siege has left an estimated 275,000 people trapped with no aid allowed in since July, amid a punishing bombing campaign. The rebel offensive started after Russia, a major Syrian government ally, said it would halt airstrikes to allow rebels and supporters to leave eastern Aleppo.
Residents of eastern Aleppo said yesterday that for days they have received text messages urging them to leave in the next 24 hours. It was not possible to immediately verify the authenticity of the messages or who sent them.
Government aircraft had previously dropped fliers on the eastern districts also urging residents to leave and make use of the Russian-declared passageways to evacuate the besieged district.
While airstrikes on eastern Aleppo city have subsided, aerial bombings of rebel-held western parts of Aleppo province continued. The Syrian Civil Defense, which operates in opposition-held areas, said one of its centers was bombed in rural Aleppo and put out of service in airstrikes on the town of Atareb. The strikes also killed three people, including two children.
Meanwhile, a suspected airstrike is believed to have struck at a border crossing in Kurdish-held Afrin canton, which links the area to rebel-held parts of Aleppo province, the Kurdish security force, known as the Asayish, said.
The Asayish statement, carried by the Kurdish news agency Hawar, said the bombing occurred early yesterday on a crossing used by as many as 5,000 people moving from western rural Aleppo to its north and east, mostly opposition areas. The Observatory put the death toll from the explosion there at 12.
It didn't say whether it was an airstrike or an explosion. In the complex terrain of northern Syria, it was not immediately clear who was behind the bombing.
Rival groups jostle for territory in northern Aleppo, including Turkish-backed rebels and rival Kurdish forces, as well as government troops, all seeking to capture areas held by Islamic State militants.
The state news agency reported Syrian troops have advanced and tightened their siege on the town, which lies about 25 kilometers (15 miles) south of Damascus and along the highway that links the capital to the southern region of Quneitra.
Other rebel-held suburbs of Damascus were recaptured by the government after a tightening siege and heavy bombings.