Labour was last night refusing to comment on allegations one of its MPs is the subject of a police inquiry following a late-night incident.

The complaint allegedly relates to an incident involving a young man.

One source said officers were understood to have interviewed several people and obtained a search warrant, although police could not confirm that last night.

The MP at the centre of the allegations did not return calls and a spokesman for Labour leader Phil Goff said there would be no comment on the matter.

Deputy leader Annette King, when approached about the MP and the allegations, also said she had "nothing to say".

Labour Party president Andrew Little said he had not heard about the issue.