Here are some videos of Common Buzzards being attacked in Llanrwst,
I went out on March the 16th and saw two occasions of Buzzards being attacked by other birds.
Seagulls attack buzzard near Llanrwst, North Wales.
Here a couple of seagulls were flying at a Common Buzzard.
Crow attacks Buzzard above Plas Yn Dre Llanrwst Part one
Common Buzzard in Llanrwst attacked by a Crow Part two