BEIRUT: At least 29 Syrian rebels were killed in clashes with regime troops overnight during a failed bid to reopen the opposition's key supply route into Aleppo city, a monitor said Sunday.

The fighters from the Faylaq al-Sham Islamist faction and Al-Qaeda affiliate Al-Nusra Front were killed trying to reopen the Castello Road, which regime forces effectively severed on Thursday, the Syrian Observatory for Human Rights monitor said.