Officers investigating the disappearance of 24-year-old Kyle Vaughan from Newbridge say they've arrested two more people.
A 27-year-old woman and a 28-year-old man, both from the Cwmfelinfach area, have been arrested on suspicion of murder.
Senior investigating officer Detective Superintendent Peter Jones said: "Eight people have been arrested during the course of the investigation.
"We are committed to finding out what happened to Kyle that night and since - and we wont stop until all avenues and lines of enquiry have been exhausted."
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The figures were obtained by Confused.com after Freedom of Information requests to 412 local authorities.
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