At least seven people were killed and thirty injured on Saturday in a car blast in a busy market place in the rebel held Syrian town of Azaz near the Turkish border.
Residents and rescuers said the blast occurred during peak late night shopping after the breaking of the fast during the holy month of Ramadan.
"It's timing comes with heavy congestion by shoppers," said Yaseen Shalabi who was near the site of the explosion shopping with his family.
There was no immediate claim of responsibility.
The Arab-populated town run by Syrian rebel groups backed by Turkey opposed to Syrian President Bashar al Assad has been relatively quiet since it was hit by a car blast over two years ago.
Main towns in the north-western border area have in recent years been frequently hit by bombings detonated in crowded civilian areas.
Residents and rebels in the mainly Arab-populated rebel-held northwest have long suspected the Kurdish led YPG who control large swathes of areas in northeast Syria and east of the Euphrates in northern Syria. Others blame groups loyal to Assad.
The YPG have long denied such claims.

Trump says Iran war deal close as Strait of Hormuz tensions linger
Victims' families mark Air India crash anniversary with prayers and tributes
Ebola outbreak spreads to crowded displacement camp in Congo
Fire breaks out at New Zealand's Wellington airport, disrupting flights
Ukraine and Russia trade overnight drone strikes, officials say
UN says Taliban arrest 30 women for violating hijab rules in Afghanistan
Trump cancels US strikes on Iran, citing progress in talks
South Korea court sentences ex-President Yoon to 30-year jail term in drone case
