Whadjuk Aboriginal Corporation and Rottnest Island Authority are continuing to collaborate on managing the human remains found on Wadjemup last Wednesday.

In a joint statement on Tuesday, the two organisations said following the conclusion of the WA Police investigation last week, the remains with Aboriginal ancestry identified during works on the main bus stop expansion will be managed under the Aboriginal Heritage Act 1972 (WA).

"The Rottnest Island Authority and Whadjuk Aboriginal Corporation are working together to ensure cultural protocols are followed, and that respectful decisions are made regarding the protection and ongoing management of the site," the statement said.

"WAC and RIA met with senior Whadjuk Elders and respected Aboriginal representatives to seek advice on the cultural process moving forward. Information was shared about the cultural heritage processes undertaken prior to the main bus stop expansion works beginning, the heritage monitors engaged during the works, and the police investigation process."

The senior Elders and representatives agreed that further investigation is needed to inform the next steps. The investigations will include a ground-penetrating radar (GPR) survey of the works site to confirm whether other burial sites may be present, as well as archaeological investigations to provide further cultural and historical context.

Whadjuk Noongar monitors will continue to oversee the site during these investigations.

"RIA and WAC will provide further updates as information becomes available," the organisations said, noting that they both "recognise the profound cultural and spiritual significance of Wadjemup to Whadjuk Noongar people and the broader Aboriginal community".

"We acknowledge and express our deep regret for the significant distress this incident has caused Aboriginal people. WAC encourages Aboriginal community members to reach out to their office or their local Aboriginal Corporation for support and information."