"This is the latest in a series of ISIS attacks over the
past several months aimed at recovering Tel Abyad,
which is the most convenient border crossing into
Turkey from the ISIS capital city of Raqqa. The Kurds
captured it in June of last year.
According to the Syrian Observatory for Human
Rights, 65 fighters were killed in the course of this
latest battle, 45 ISIS fighters and 20 others from the
YPG. The Kurds insisted the town was successfully
defended..."
http://news.antiwar.com/2016/02/28/65-killed-as-isis-attacks-kurdish-held-syria-border-town/