The Kurdish fighters, known as the People’s Protection Units or YPG, have been making territorial gains since capturing the Syrian border town of Kobani last month following a several-month struggle.

The British-based Syrian Observatory for Human Rights says Kurdish fighters, supported by Arab militias and airstrikes from the U.S.-backed coalition, captured Friday the eastern and southeastern approaches to the town of Tel Hamees in Hassakeh province.

Nawaf Khalil, a YPG spokesman, says Kurdish forces have actually entered the ISIS-held town.

The Observatory says ground battles and air strikes around Tel Hamees have killed at least 175 ISIS fighters in the past several days.