The accused are owners of Jabal-e-Noor Paribahan Jahangir Alam and Shahadat Hossain, drivers Masum Billah and Zobair Sumon and helpers Enayet Hossain and Kazi Asad.
Later, the court framed charges against four accused on October 25 last year.
Of the six accused, four are now behind the bars while Kazi Asad and Jahangir Alam are on the run.
Among the accused, driver Masum Billah and bus owner Shahadat Hossain gave confessional statements before the court under section 164 of the Code of Criminal Procedure.
On July 29, Dia Khanam Mim and Abdul Karim Rajib, students of Shaheed Ramiz Uddin Cantonment College, were killed when a Jabal-e-Noor bus ploughed through a crowd while competing with another bus of the same company in front of the Kurmitola General Hospital on Airport Road.
Dia's father Jahangir Alam filed a case with Cantonment Police Station.