TWENTY suspicious fires have been lit within a 30-minute period across Melbourne's southeast.
Police said 20 small shrub and grass fires were lit between 9pm and 9.30pm yesterday.
Two men were arrested after police stopped a car near the scene of one of the fires.
A 20-year-old from Narre Warren and a 16-year-old from Berwick were interviewed and later released.
Investigators are appealing for witnesses that may have seen suspicious activity around Narre Warren, Berwick, Cranbourne or Harkaway.
No injuries or property damage were reported.