Two more people have been arrested in connection with the death of a man in Worcester.
Andrew Heath, who was originally from Leicester, was found dead at his home in Warndon in December after a suspected arson attack.
Police believe his death could be linked to his convictions for sexual offences.
It follows four recent arrests. One person is being held on suspicion of murder and three on suspicion of perverting the course of justice.
More top news
The 37-year-old was helping authorities in the country track the criminals when his aircraft was fired upon in January.
Labour strongholds tended to remain so - apart from a major loss for the party in Dudley.
Labour suffered losses in English council elections, but the initial results were not as bad as many had expected.