The militants in three tanks crossed into Syria via the Turkish border on Thursday in an effort to take control of the town of Ras al-Ain.
Foreign-sponsored militants have launched similar attacks on the border town, targeting Syria’s Kurdish population.
Many people, including large numbers of security forces, have been killed in the turmoil that broke out in Syria nearly two years ago.
Meanwhile, militants from the notorious Farouq brigades clashed with another group of militants in the northwestern province of Idlib as divisions between the armed groups worsen.
The fighting was apparently in retaliation for the assassination of Tha’er al-Waqqas, a senior Farouq commander, in the northwestern town of Sarmada last year. Waqqas was reportedly linked to the killing of Firas al-Absi, a Saudi-born Syrian militant.
Rivalries and conflicts among the militants fighting against the Syrian government have turned into a problem for the supporters of the armed groups. There are several armed groups with different causes fighting in the Arab country.