Three people have been arrested in relation to an aggravated robbery of a hotel in Dunedin this week.

A group of people entered the Law Courts Hotel at about midnight on Thursday, threatened an employee with a knife and stole cash.

A 28-year-old man and 25-year-old woman have been charged with aggravated robbery and are due to appear in the Dunedin District Court tomorrow.

A 47-year-old woman has also been charged with aggravated robbery and is due to appear in the Christchurch District Court tomorrow.

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The arrests followed search warrants carried out in Dunedin and Christchurch today.

Detective Sergeant Dave Nelson said a cross district team effort led to the early arrests.

"It was a great team effort both here in Dunedin and with our colleagues in Christchurch that enabled the alleged offenders to be arrested and charged in such a short period of time."

Nelson said as the investigation was ongoing further charges could be laid.