A teenager is being treated for burns in hospital and another male is on the run after allegedly setting fire to a restaurant in Melbourne's south-east.

Just after midnight, Protectice Services Officers (PSO) patrolling Springvale Station were told that two males had broken into a Korean barbecue restaurant on Springvale Road. 

Shortly after, black smoke could be seen coming from the building and firefighters were called.

Nobody was inside at the time. 

The pair is believed to have fled in a vehicle before police received reports that a teenage boy with burns was at a nearby fast food restaurant on Warrigal Road in Heatherton. 

The 15-year-old boy was taken to hospital under police guard and the investigation remains ongoing as officers search for the other male believed to be involved.

It is the seventh straight day of arson attacks across the city. 

In a botched firebombing of two vehicles in Taylors Hill, in Melbourne's north-west, on Monday morning, a 13-year-old boy suffered severe burns to 90 per cent of his body.

He remains in a critical condition and is fighting for his life. 

On Friday, his sister urged other Victorian children not to accept money in exchange for carrying out crimes. 

It came after it was revealed the group of youth involved in the Taylors Hill attack had been tasked with lighting the fire by middlemen on WhatsApp.