Kolkata (Agencies): A city court extended the bail of the principal and three teachers of La Martiniere for Boys school in connection with the death of 13-year-old student Rouvanjit Rawla and will hear on framing of more serious charges on February 17.

The four accused, including principal Sunirmal Chakravarthy, appeared in the city sessions court of chief Judge Dipak Saha Ray for confirmation of the bail earlier granted by the chief metropolitan magistrate's court.

The other teachers were the head of middle school, L G Ganian, David Ryon and Partha Dutta.

Ray fixed February 17 as the next date of hearing for consideration of framing of charges against the accused teachers under IPC 305 (abetment to suicide).

Rouvanjit, a student of class eight of La Marts, hanged himself on February 12, 2010, after being caned by the principal and three other teachers.

After his father Ajay Rawla lodged a complaint with the local police station accusing the principal and three teachers of abetment to his son's suicide, police made four arrests on October four.

The police later booked them under Sections 323, 324 and 352 of the IPC and Section of 23 of the Juvenile Justice (care and protection of children) Act, 2000 which are bailable sections.

On November 12, the metropolitan magistrate charged the four accused with abetment to suicide and sent the case to the city sessions court for trial.

On January 31, a city court upheld the order of the metropolitan judge to try them under more serious charges than those earlier framed by police.