Three teenagers have been arrested in relation to armed robberies in Thomastown and Laverton between January 8 and January 10.

The teens, two aged 16 and one 17, were arrested at a Sunshine shopping centre on Sunday morning.

The robberies occurred at service stations in Laverton North on January 8, and on Keon Parade and Dalton Road in Thomastown on January 10.

A 16-year-old from Reservoir was charged with armed robbery, theft of motor vehicle, theft, false imprisonment and assault, a police spokeswoman said.

A 16-year-old from Tarneit and a 17-year-old from Kurunjang were charged with armed robbery, theft of motor vehicle and theft.