Metro Manila (CNN Philippines, March 23) — All ten suspects in the hazing death of law student Horacio "Atio" Castillo III have "voluntarily surrendered" to the National Bureau of Investigation (NBI).

The NBI said its agents picked up the Aegis Juris fraternity members at a location in Manila Friday morning, after getting a call from a "common friend" saying they wanted to turn themselves in.

The suspects will be detained at the NBI headquarters in Manila, pending a court order.

They surrendered "to ensure their safety," NBI spokesperson Ferdinand Lavin said in a media briefing where the suspects were presented. They were accompanied by their parents and lawyers.

The Manila Regional Trial Court on Thursday ordered the arrest of Arvin Balag, Ralph Trangia, Oliver John Audrey Onofre, Mhin Wei Chan, Hans Matthew Rodrigo, Joshua Joriel Macabali, Axel Munro Hipe, Marcelino Bagtang, Jose Miguel Salamat, and Robin Ramos for Atio's death.

On March 8, the Department of Justice indicted the ten fraternity members for violating the Anti-Hazing law, a non-bailable offense punishable with life imprisonment.

Atio, a 22-year-old freshman University of Sto. Tomas law student, was killed after a supposed "welcoming party" or hazing rites of the Aegis Juris fraternity on September 16, 2017. His parents said he promised to come back on September 17, Sunday.

Police said Atio had hematoma or bruises on both upper arms, as well as marks of candle wax drips all over his body.

His death has spurred calls for stricter anti-hazing measures.

READ: Senate OKs new anti-hazing bill on third and final reading