BEIRUT - Islamist militants and their local supporters have killed at least 22 people in a village in northern Syria near the Turkish border, opposition activists said on Wednesday.The Syrian Observatory for Human Rights monitoring group quoted residents in Shuyukh, 100 km (65 miles) northeast of Aleppo, as saying that militants from the Islamic State of Iraq and the Levant (ISIL), had killed 12 fighters from rival rebel groups and at least 10 local tribesmen, including a 16-year-old.The British-based watchdog, which has a network of sources across Syria and opposes President Bashar Assad, said the men had been executed by gunfire and knives. It said at least nine other villagers were missing and suspected to have been killed.Media activists circulated online a list of people they said were victims. They named 20 people killed and nine missing, and said four bodies had been thrown into the Euphrates River."Residents of Shuyukh betrayed the mujahideen. Then ISIL stormed into the area," said an opposition activist who runs a Facebook page for the Jarablus area, which includes Shuyukh.