A brutal attack by ISIS on the Syrian border town of Kobane has killed up to 146 civilians, according to the Syrian Observatory for Human Rights (SOHR).
Head of the Britain-based observatory, Rami Abdulrahman, has been tracking several sources on the ground in order to discover the number of casualties in the city. ISIS entered Kobane on Thursday - after having first abandoned the city several months ago - and the number civilian lives lost in their attack represents the second biggest massacre the hardline militant group has carried out in Syria so far. The most devastating massacre by the group was the killing of hundreds of members of the Sunni Muslim Sheitaat tribe in eastern Syria last year.
Following fierce clashes with Syrian Kurdish YPG forces in Kobane, a car bomb explosion executed by ISIS in the city left a dozen dead and many wounded.
ISIS militants were disguised as YPG and Free Syrian Army fighters when they attacked the city from three distinct locations, Al Jazeera correspondent Nisreen Al Shamayleh reported.
A number of ISIS militants wearing explosive belts positioned themselves in several areas in the town and blew themselves up.
Kurdish forces regained authority over Kobane with the help of the US-led anti-ISIS coalition by the end of January this year after a siege by ISIS that lasted for four months.
US President Barack Obama said on Monday that he was "confident that although it is going to take time, we are going to be successful, ISIL is going to be driven out of Iraq and ultimately it is going to defeated," referring to ISIS with its alternative acronym.
Kurdish activists on Twitter accused Turkey of permitting ISIS militants to enter Kobane through the Turkish border, Al Jazeera reported.
However, the governor's office in the Turkish province of Sanliurfa denied these accusations and said that there is clear evidence showing the militants entered Kobane from the Syrian town of Jarablus, to its west.
Turkey has witnessed a massive influx of Syrian refugees in the past few weeks due to ongoing clashes between the YPG fighters and ISIS militants, most recently for the border town of Tal Abyad.