A Drogheda woman who alleged she was raped by two Lithuanian men in March is to be re-interviewed by gardaí after DNA tests showed no evidence of sexual assault.

A senior garda source said that, while more DNA test results are expected, to date none of the results matches the DNA of any of the six Lithuanians the woman was with on the night of the alleged assault.

The men voluntarily gave DNA samples following their arrest after the altercation between two groups in March at a beauty spot in the Townley Hall estate on the banks of the river Boyne, near Drogheda.

The woman claims she was raped by two of the Lithuanian men. A source said it was a complicated case with a lot of allegations and counter-allegations on both sides.

"We have always had an open mind as to whether or not this happened. This investigation is a lengthy one. We will be speaking to the woman who made the allegation and also the other three in the coming days," said one source.

Two couples – two young men and two women in their teens and 20s, all from Drogheda – said they were sitting in a car when they were approached by the gang at around 4am on 12 March.

Gardaí were told the gang used iron bars and sticks to attack the group, and that one of the women was dragged away from the car to a wooded area by two men where she was allegedly raped.

However, the six Lithuanian men gave an entirely different version of events.

"As far as we can determine, this group of men were having a few drinks with the two couples that night. They admit an altercation [occurred] but completely deny any rape. They said there was no sex whatsoever," according to a source.

"They quite happily gave DNA. The men admitted being there with the two couples and admit there was an altercation. They admit defending themselves in an altercation. We have to wait and see how things progress."

The men were arrested shortly after the row between the two groups but were later released without charge and a file was sent to the DPP.

After this, there was intense media speculation that the men had fled Ireland, although it transpired they had not. Only one man left the country but he later returned.