Ashley Greene Fire No Crack Pipe Or Arson Evidence

11/2/2014 12:35 AM PDT

Ashley Greene Fire -- No Crack Pipe Or Arson Evidence

EXCLUSIVE
Cross crack pipe off the list of possible reasons Ashley Greene's apartment went up in flames -- according to Sheriff's investigators who sifted through the burned out pad right after the fire.

TMZ broke the story ... Ashley's building manager says a cleanup crew claimed to have found a glass crack pipe in Greene's unit. But we got hold of a report filed by the Sheriff's Arson/Explosives Unit ... and there's no mention of a crack pipe.

That could mean there was NO pipe, but it could also be that investigators just missed it. According to the docs ... there was also no sign of arson.

As we first told you ... a preliminary report said a candle ignited a sofa -- and indeed, the Sheriff's doc 
says investigators could NOT rule out an accidental cause.