Within two minutes of a mother leaving her three children aged under five at home alone, a smoke alarm sounded.

Fire would soon engulf the property and kill two young girls, a one-year-old and a five-year-old.

Their mother, Shania Lee, allegedly heard screaming as she watched home security cameras on her phone after leaving.

"Investigators believe that the referred screaming is in relation to children during the fire," Detective Senior Constable Chris Mitchell told Melbourne Magistrates Court on Wednesday.

"It's upsetting and an aggravating circumstance in relation to this offending ... exacerbated by the fact that Lee did not call triple zero to assist her own children."

Lee allegedly told co-accused Matthew Mcaulliffe about hearing screaming over a recorded prison phone call, he sai

See Full Page