ISIS extremists destroy precious works of art

The "Islamic state" has posted a video in which the extremists destroy some valuable artifacts preserved in the museum of the city of Mosul in northern Iraq.
In the video the jihadists killed and then grind some large statues.

Among the objects destroyed there is a winged bull of an artist of the ninth century BC Assyrian

The caption accompanying the video says that the objects in question are "false idols", therefore Mohammed wants to be destroyed.