BEIRUT (AP) — Syrian opposition activists say government shelling of a camp hosting displaced people near the Turkish border in the country’s northwest has killed at least 15 people.

Britain-based Syrian Observatory for Human Rights, an opposition war monitor, says government forces shelled camp Qah, killing 15 and wounding others.

The Aleppo Media Center, an activist collective said the government shelled the camp with rockets Wednesday inflicting the casualties including 15 who were killed.

Syrian troops launched a four-month offensive earlier this year against the country’s last opposition stronghold, which is dominated by al-Qaida-linked militants.

The government offensive forced hundreds of thousands of civilians to flee their homes. A fragile cease-fire halted the advance at the end of August, but in recent weeks it has been repeatedly violated.