The motorway is currently closed in both directions between junction 21a and 22 due to smoke generated from the incident. @HFRS have requested a full closure on #M25 near #StAlbans in both directions between J22 and J21a due to a significant off-network fire. Risk of a secondary explosion, along with smoke and debris affecting the carriageway. Risk of a secondary explosion, along with smoke and debris affecting the carriageway. All emergency services on scene.