Dear brother Jawaid and other brothers & sisters !
i want to mention my opinion:-)
a crime has happened, and for sure, we humans have done it ! First of all we are humans, and we are all from Allah and eventually returning to Him. Allah knows best everything. A muslim is not supposed to be a believer, but a believer is surely a muslim. Then, no matter if Muslims or Christians have done it. As a Believer in Allah, The Last Day, The Angels, The Messengers, And The Book, will not let himself do such a crime.