One brother holding a student visa and the other on a bridging visa, concerns about their potential flight risk have heightened, especially as their family is believed to reside in India.
Around 170 members from RSIPF, Australian Federal Police, Australian Defence Force and Fiji Police Force attended the exercise held at Hells Point, Honiara.
The crash killed 42-year-old mother Nancy Lefrançois and her 11-year-old son Loïc Chevalier, who were travelling in a passenger vehicle struck in the collision.