At least 412 people have been killed since the Islamic State in Iraq and the Levant (ISIL) launched attacks on Ain Al-Arab (Kobani) on September 16, a monitoring group said on Monday.
The Syrian Observatory for Human Rights added in a statement that it had documented the killing of 20 civilians and up to 219 ISIL members in clashes with Kurdish fighters.
According to the Observatory, 163 members of the Kurdish People's Protection Units were killed over the three weeks.
Other nine fighters supporting the Kurdish Units were also killed in clashes with ISIL in the Kobani countryside, in addition to one volunteer targeted by the militants in the town.
The London-based Observatory stressed that the actual mumber of deaths could be double the figure it documented, attributing this to the reticence about human losses and the difficulties to have access to the areas and villages where heavy fighting is raging between the two warring parties.