First, I am so sorry that he chose this as a means of getting attention or making you feel quilty.
Repeat after me...
"I did not do this." "I am not responsible."
He made the choice to do this himself. He will try to lay the blame on you. Get ready for the onslaught.
Your son certainly has issues that need to be addressed. Let the people who know what they are doing address those issues with your imput. I've said before, if I had stopped falling for my difficult child's manipulation, maybe things would not have gotten as bad as they got.