IOI organizers do not have the authority to comment on such an issue.
Why they didn't condemn the invasion of Iraq, Afghanistan, Yemen, Palestine and Syria?
Because their people are not European? or because the attacks were carried out by the United States, Saudi Arabia and Israel?
War is bad, but it must be bad for everyone, regardless of skin color or location.
We should not condemn an attacker and ignore another one. This is completely racism.