This is a striking video showing what happened to a hill near Kobane, where ISIS had just planted a flag. ISIS fighters were unaware that the position was going to be literally buried by bombs dropped by coalition jets.
B-1 bombers have been spotted over Kobane several times in the last few weeks, as the Syrian village near the Turkish border is the theater of a fierce battle between ISIS and Kurdish forces.
Although an identification of the weapons used in the air strike is almost impossible, the following image is a frame from the footage with the bomb (most probably an LGB) highlighted.
Dropping that many bombs on a flag and only a couple of ISIS fighters may seem like overkill. However, it was likely a symbolic attack.
You can watch the video here.