Three more suspects have been arrested in connection with allegations of slavery in South Wales, Gwent Police said.
A third alleged victim has also been recovered from one of the sites being searched by detectives, police added.
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Detectives in Westminster are investigating after the man was discovered on the Route 189 bus in Marylebone shortly after midnight.
The murderer was shaking and appeared to be gasping for air for around 13 minutes before dying.
The positive results come after Chancellor Philip Hammond admitted the government is prepared to sell its stake at a loss to the taxpayer.