DCI Pirie urged anyone who attended the gathering and has not yet contacted police to do so as soon as possible.
She said: “We particularly want to hear from anyone who can provide information to support our investigation.
“If you were at the party and have not spoken with officers yet, or you have any CCTV, mobile phone, dash cam or doorbell camera footage covering Park Road and the surrounding area, then please get in touch.”
The senior investigating officer stressed that even seemingly minor details could prove valuable, adding: “Any information, however small it may seem, could help our enquiries.”
