As is well known, the International Law Commission (ILC) decided in 1976 to include an article in its Draft Articles on State Responsibility that makes a distinction between normal international wrongful acts, which it called delicts, on the one hand, and exceptionally grave breaches of international law which it called international crimes, on the other hand.
"Can A State Commit A Crime? Definitely, Yes!,"
ILSA Journal of International & Comparative Law: Vol. 4
, Article 2.
Available at: http://nsuworks.nova.edu/ilsajournal/vol4/iss2/2