Military raids carried out by troops on the ground carry the risk of a troops being killed or captured, but they also allow the forces to collect bodies or other material as evidence.
'It is with great sadness and shock that we are writing to let you know that Gabrielle Maina has been tragically killed whilst out walking this morning,' the statement read.
The newspaper said that while not charged with offences relating to chemical weapons, it is alleged that Hashi and his two co-accused had 'substantial knowledge' on an al-Shabab department that was developing chemical weapons and that this will form part of the case against them.
Hashi and the two other men are awaiting trial in New York.
'It is important for them (Department of Foreign Affairs) to keep on pushing until it is certain as to what caused her death,' Ms Maina's lawyer told ABC Radio on Sunday.
Friends said Ms Maina was an 'exceptional mother' to her two young sons and 'passionate teacher'.'She was a strong woman, she never let anything get her down and she overcame her hardships bravely,' one close friend from Sydney told Daily Mail Australia.'She was passionate about education and her role as a teacher.'She was an exceptional mother, nurturing and did her best for her two young sons.' Ms Maina was working as a head teacher at Hillcrest Preparatory, a local boarding school, teaching English, Drama and Italian.