The same thing happened to me. I lost over 122k of food. The attacker lost all his troops, hardly stole any resources and then targeted one of the farms with rally.
Definitely a hack/exploit. I don't have the iPad with me right now, and since the app update this morning I can no longer watch replies, so no screenshots, but I'll get the player name later today.
This should be fixed asap, resources refunded, and cheating players banned, period.