Two Victorian teenagers charged with murder have refused to board the prison van to attend court, leaving a magistrate and prosecutors frustrated.

The pair were arrested after the deaths of Dau Akueng, 15, and Chol Achiek, 12, who were allegedly stabbed to death in Melbourne's west last month.

In total, eight people have been charged with murder, with five under the age of 18.

The five underage accused were due to face a Children's Court on Friday.

Three had their cases administratively adjourned, however a court order was put in place requiring the state's youth justice department to ensure the other two — a 16-year-old and 15-year-old — attended in-person.

Prosecutors had intended to make an application for compulsory DNA samples from the boys, which required them to be in the court

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