In a statement, Benjamin Mbonimpa, representing the M23 delegation in Doha, said the agreement contained "no binding clauses" and would not change "the situation on the ground".
Now it is under greater scrutiny than ever before, following the revelation that a documentary it aired last year misleadingly edited a speech by US President Donald Trump.
Thick columns of black smoke rose hundreds of meters into the night sky, illuminated orange from the massive blaze, as witnessed by AFP reporters near the site.