No Prisoners of War [clarification pending]

An Il-76 airplane has crashed in Russia's 

it was transporting over 60 Ukrainian prisoners. Some Ukrainian media initially said it carried S-300 missiles and was "the work of the Ukrainan [forces]", but then withdrew/redacted the claim.

What did the plane carry? I will resolve to every significant type of cargo/kind of passanger according to (Western) media/expert consensus. If the answers are not clear by market expiration, I will either resolve N/A or extend the deadline. I may resolve early if the answers seem clear.

Please only add specific and non-trivial answers, not e.g. "things" or "its own crew"; I will delete anything else.