A 13-year-old is in critical condition after being severely burned in an arson attack that occurred in Melbourne's north-west on Monday. The teenager was engulfed in flames during the incident and is currently fighting for their life. Investigators believe the firebombing was ordered via WhatsApp, indicating a premeditated attack. Authorities are investigating the messaging app communications to identify those responsible for instructing the attack. The incident has shocked the community in Melbourne's north-west, prompting increased police presence and concern for public safety. Details surrounding the motive for the attack remain unclear as the investigation continues. Police are urging anyone with information to come forward and assist with their inquiries.