'Horrendous' balcony collapse injures nine

Nine people have been rushed to hospital with cuts, bruises and suspected broken bones after a balcony collapsed during a party in Brisbane.

Five people were taken to the Royal Brisbane and Women's Hospital, while another four were rushed to the Princess Alexandra Hospital after the accident at a St Lucia property on Saturday evening.

"Five to seven people were on it and it just collapsed underneath us ... it was horrendous to see," witness Julia Saleemi told the ABC.