Detectives investigating the murder of Constable Dave Phillips have this afternoon arrested a man and a woman.
The 39-year old man and 59-year-old woman, who are both from Wallasey, were held today on suspicion of assisting an offender.
They are both being questioned at police stations in Merseyside.
Six people have now been arrested in connection with the killing.
Two women - a 19-year-old and 34-year-old, both from Wallasey - were arrested on Tuesday night on suspicion of assisting an offender.
On Tuesday afternoon, two men were arrested on suspicion of murder. The pair, aged 18 and 30 years from Oxton and Wallasey, remain in police custody.
34-year-old father-of-two PC Phillips was killed trying to stop burglars escaping in a red Mitsubishi they had taken from an estate agent in Birkenhead, in the early hours of Monday morning.
More follows.
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