Syrian government airstrikes hit a vegetable market in a northern opposition-held town Thursday, killing at least 30 people and wounding scores of others, opposition activists said.

Fighter jets hit the crowded market in the Aleppo province town of Atareb early in the morning, killing 30, the U.K.-based Syrian Observatory for Human Rights said. The group, which documents the Syrian conflict through a network of activists on the ground, said the death toll is likely to rise because many of the victims were seriously wounded.

Atareb is located near the city of Aleppo, which is Syria’s largest urban center and former commercial hub, and a major battleground in the country’s civil war.

Another activist group, the Syria-based Local Coordination Committees, said the airstrikes killed 24 people. The Aleppo Media Center activist group said the strikes killed more than 20. The discrepancy in the death toll is not unusual in the immediate aftermath of such large attacks, and could not be immediately reconciled.

The Syrian conflict began in March 2011 as largely peaceful protests against President Bashar al-Assad’s rule. It turned into a civil war after some opposition supporters took up arms to fight a brutal government crackdown. The fighting has taken on increasingly sectarian overtones, pitting predominantly Sunni Muslim rebels against Assad’s government, which is dominated by Alawites, a sect in Shia Islam.

More than 150,000 people have been killed so far, activists say, and millions have been driven out of their homes.

Meanwhile Thursday, Hassan bin Abdullah al-Nouri, a 54-year-old lawmaker and a former minister, became the second candidate to register his bid for the presidency, officials said. A day earlier, a lawmaker from Aleppo announced his candidacy for the June 3 vote.

Al-Nouri was educated in the United States and hails from a Sunni Muslim family in Damascus. He previously served in Assad’s government as a state minister for administrative and parliamentary affairs.

Assad has suggested he would seek a third seven-year term, though he has not announced his candidacy yet.

According to a new election law, the balloting must be contested by more than one candidate. Several candidates are expected to run against Assad to give the election a veneer of legitimacy after it was dismissed by the West as a farce.

Also in Damascus, a spokesman for the United Nations agency that helps Palestinian refugees in the Middle East said that aid workers resumed food distribution inside the Damascus camp of Yarmouk after 15 days of being prevented from entering the area. Chris Gunness said UNRWA aid workers distributed 300 food parcels to desperate residents Thursday.

A day earlier, U.N. Secretary-General Ban Ki-moon said neither side in the war has implemented a U.N. resolution demanding that the opposition and the Syrian government promptly allow access for humanitarian aid. Almost 3.5 million civilians in Syria have almost no access to desperately needed humanitarian aid and people are dying needlessly every day, Ban said.

The Associated Press