We've now concluded our investigations at the scene of this incident.
Our specialised identification teams, working closely with our on-scene crews, were able to confirm that the substance identified was not harmful to the public.
Our crews are currently making up equipment and resources at the scene and are expected to leave shortly.
Road closures will likely be lifted in the near future. Tram operations will also be safe to resume, subject to confirmation by West Midlands Metro.
We'd like to thank our communities for their patience while we worked to keep them and the area safe.