Yes, but there are too many accounts to report all one by one. The organizer should manage it.

Np just send email and cite all this account because it belong to only one user

Are you all referring to the sudden surge of new participants in the last few hours? I think @Zindi should consider preventing new users from joining a competition within the final five days before it ends. Just my opinion!

You can notice that all are from the same country almost the same date of account creating and almost the same result and name that this not seems suspected to you ?

Good Idea

Finally, those fake accounts are not removed after the private scores have been revealed... @Zindi

They will definitely remove them. They must first be sure about it.