At least 20 fire engines and 125 firefighters sent to burning block, where smoke could be seen for miles.
The Met Police appeal comes after a man was charged with the murder of Tiparat Argatu in east London.
Two people have been arrested.
'Evil, gut-wrenching, rancid blob' to be turned into pure green fuel.
Could two of the most notorious serial killers of the 19th century be the same man?