More than 30 former residents of a makeshift Kalihi Valley home that collapsed last year have sued the homeowner and landowner in federal court.

The lawsuit alleges that as many as 100 people lived in the five-bedroom house, which had been illegally expanded with a series of structures built out of pipe and plastic tarps.

Four of the plaintiffs allege in the suit that landlord Daniel Cunningham injected them with a substance that he said was "part of a stem cell research he was conducting."

Cunningham, 56, told The Advertiser last year that he provided "stem cell therapy" injections to some of his tenants at the house.

He also said he was undergoing the same therapy himself and that it had helped him stay healthy and fit.

The lawsuit claimed the injections had caused "serious personal injury" to the tenants who received them.

The suit seeks unspecified damages from Cunningham and landowners at the home site on Gulick Avenue.