Freddie Thompson and Daniel Kinahan at the funeral of David Byrne

Two feared criminals on opposite sides of the deadly Hutch-Kinahan feud are business partners in a Dublin beauty salon.

The arrangement between the rivals shows how interlinked the gangsters involved in the feud are.

Company records obtained by the Herald show the pair are registered directors of the salon.

Both men are suspected of involvement in the April 2010 murder of Eamon 'The Don' Dunne (34) on behalf of the Kinahan cartel and were arrested in relation to the shooting.

They were close associates of slain Gary Hutch (34), but after he was murdered in Spain last year, one of the criminals became a sworn enemy of the cartel while the other remained loyal.

The criminal who switched allegiance - a north-inner city mobster in his late 20s - is suspected by the cartel of being one of the fake Emergency Response Unit hitmen involved in the Regency Hotel attack.

A six-man hit squad stormed the hotel armed with handguns and automatic weapons and senior Kinahan lieutenant David Byrne (33) was shot dead.

Warning

Gardai believe he was one of the shooters in the murder of Paul Kavanagh, who was gunned down in March 2015.

The killer previously issued a stark warning to detectives who raided his apartment, saying the feud would not end until cartel kingpin Daniel Kinahan was dead.

"We won't rest until Kinahan is dead. He caused all of this - it won't end until he's in his grave'," the gunman told armed detectives, who were stunned by his blunt statement.

The gangster is a close associate of Keith Murtagh (32), an armed robber who was the intended target of a botched assassination attempt earlier this month. That incident saw innocent man Martin O'Rourke (24), a father-of-three who had no involvement in the feud, shot dead.

The other man listed as being involved in the beauty salon, a Kinahan cartel associate aged in his 30s, is a feared enforcer for the gang and is regularly spotted in the company of Byrne family members.

He was seen at the Byrne family home on Raleigh Square only days before his friend was shot dead in the Regency Hotel.

The individual has also regularly attended boxing events involving fighters from the Daniel Kinahan-run gym in Marbella.

Despite the two men being on opposite sides of the bloody feud that has so far claimed four lives, they continue to be registered directors of the salon.

Neither man is believed to be involved in the day-to-day running of the enterprise.

Another company linked to the feud is LF Car Sales, of which convicted drug dealer Greg Lynch (31) is listed as a director. The registered address was one of a number of premises searched during a series of raids last month by garda units targeting the Kinahan cartel.

Lynch, whose home address was raided two weeks ago, is understood to be living as a relative recluse at his home in the Maryland area of the capital after surviving a gangland assassination bid in 2013. Nevertheless, he is often seen in the south inner city in the company of criminal associates.

Also targeted in last month's raids was a pub that gardai believe is used as a front for the Kinahan mob.

Raided

The pub, located in the heart of the north inner city, has Liam Roe (35) registered as its director on company records. Perma-tanned criminal Roe is a cousin of Liam Byrne and Freddie Thompson.

The premises were raided by officers attached to the Criminal Assets Bureau (CAB) in an operation that targeted the financial power of the gang.

It is run by an individual from the north-inner city who has close links to the Byrne family.

Despite the manager having no direct involvement in criminality, detectives suspect the pub is used as a front by the cartel as well as regularly hosting crime meetings.