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Police investigating how a five-week-old baby ended up with both arms and a leg broken say numerous interviews with the family have made it no clearer who inflicted the injuries.
Police were alerted after the baby girl was admitted on August 18 to Christchurch Hospital.
Medical authorities have assessed her injuries as "non-accidental" but extensive police inquiries and interviews with the baby's family have failed to conclusively identify the person who inflicted them.
A member of the baby's extended family is understood to have strong gang affiliations.
Head of the Christchurch police child abuse unit Detective Sergeant Neville Jenkins said today the investigation had reached a "static" stage.
"We have conducted a number of interviews but made no progress in identifying or gathering enough evidence to proceed to court with an offender," Mr Jenkins said.
"We have done as much as we can at this point. We may revisit some of the interviews again, but we're progressing no further in terms of making an arrest."
Mr Jenkins said police became involved as soon as the baby was admitted to Christchurch Hospital with multiple arm fractures.
Doctors then discovered she also had a broken leg, and believed the baby's injuries were inflicted "some significant time before she was taken to hospital".
"We know they are definitely non-accidental injuries, there's no question of that," he said.
"Five-week-old babies don't fall off swings."
Mr Jenkins said the investigation file was "still open and active".
"But it's static in terms of making an arrest."
- NZPA
