The investigation, code-named Operation Russell, allegedly raised questions about former commander Ray Adams's conduct before the Lawrence case, the Guardian said.
There was reportedly insufficient evidence to bring criminal charges and Adams told the newspaper this exonerates him and denied any wrongdoing.
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The veteran singer showed even the greats have their off days when she had to stop halfway through and apologise to the audience.
So-called Islamic State fighters have re-entered the historic city of Palmyra in central Syria, activists say.
The driver stopped at the scene and the boy was taken to hospital, but he died on the way.