What is the ruling on eating halal food that is cooked by infidels?

Religious Authority: 
Ali al-Sistanti
Fatwa Question or Essay Title: 
What is the ruling on eating halal food that is cooked by infidels?

Christians are pure, and he whose religion is unknown is not ruled to be unclean. However, if you know that he has been touched by infidels who are not people of the book, then he is unclean and forbidden.

ما حكم الذي اكل اكلاً حلال ولكن الذي یطبخ من الكفار؟ المسیحي طاهر ومن لا یعرف دیانته ایضاً لا یحكم بنجاسته ولا یجب الفحص ولكن اذا علمت انه اصابه كافر من غیر اهل الكتاب فهو نجس وحرام.