ALF activists spray painted a bomb threat at Wageningen University in the Netherlands because they do animal research. Never heard of that approach.
From Bite Back:
"In the morning of June the 15th the ALF went back to the Wageningen university. For more than a year this university has been warned about their meaningless experiments on various animals and especially pigs (obesity research).
But the Wageningen university decided to do NOTHING and even sent the police after us! We are trying to help you!
So we painted the messages: Danger Bomb, Warning Bomb and Stay Away.
We also busted a window through which we supposedly gained
entrance to plant a bomb. But we didn't and took off."