The district court released a third suspect Wednesday, saying there was insufficient evidence to keep him behind bars. A detention hearing with a fourth suspect will be held Thursday.
In closed hearings, the court approved the prosecutor's request to keep two men detained for up to two weeks as the investigation continues. Both are suspected of assisting a robbery.
In the Sept. 23 robbery, masked gunmen broke through a roof window and set off explosions inside the facility before taking off in a helicopter with an undisclosed amount of cash.