Authorities are now investigating the allegations of assault, one of the three complaints in six months, relating to a Park Health village.

Wellington retirement village, which has 150 residents in 36 villas -- a three-storeyed apartment block, a 32-bed hospital wing and a 30-bed dementia wing -- reported an assault on one of the residents.

It was believed that a staff member allegedly hit a resident and a police complaint was made in February.

An earlier police investigation into the incident at the village proved inconclusive. So, Wellington's Capital and Coast District Health Board is now looking into the safety of residents at the rest home, The Dominion Post reported.

A complaint about the care of a patient in October 2009 prompted the Health Ministry to conduct an unannounced inspection, which found several breaches of health and disability service standards.

Pain and incontinence assessments were not detailed and there were incomplete medicine management processes.

Another complaint, also about the care of a patient, was laid to the health and disability commissioner in March this year.