Atlanta police have launched an internal investigation into filmmaker Tyler Perry's claim he was racially profiled by two white officers who pulled his car over, the police department said.

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Tyler Perry’s profiling claim probed

Wiltshire’s deputy chief constable, who was removed from his duties while an internal investigation took place, is found dead at his home.

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Top policeman found dead at home

The CIA was cautioned last year that a self-proclaimed al-Qaeda turncoat might be luring the agency into an ambush, a warning that came weeks before the man killed seven agency operatives in a suicide attack in Afghanistan, an internal investigation has found.

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CIA: Systemic failures led to suicide attack

An internal investigation puts some responsibility for the Gulf oil disaster on BP but assigns much of the blame to contractors Halliburton and Transocean.

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BP points fingers in rig blast

BP is to release an internal investigation into the oil spill in the Gulf of Mexico, the worst ecological catastrophe in recent US history.

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BP due to publish oil leak report