A47 Saltley Road in both directions closed due to the fire at Smurfit Kappa Paper Mill between B4114 Saltley Viaduct / Mainstream Way and Aston Church Road.
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David Brickwood was killed at his home last year in what police believe was a pre-planned robbery.
Merlin, the operator of the park, has been told it should expect a "very large fine" for breaching health and safety.
Your Monday morning weather forecast with Helen Plint.