Investigators tell LOOP News that the case is such that there must be hard evidence linking suspects to the crime to ensure a chance of conviction.
As of last week the main suspect, a mature age student aged 26 was arrested and is now at Bomana Prison waiting to appear in court on charges of sexual penetration.
Four other suspects are still at large but their identities are known to police.
Police are giving the suspects a chance to surrender or pictures of them will be circulated to media outlets for publication.
