Boys, 15 and 17, on armed robbery charges

Four teenage boys have been charged over an armed robbery at a Melbourne milk bar.

It's alleged the youths entered the Brunswick West premises armed with a knife and baton on Friday evening and demanded cigarettes. The four were arrested a short time later.

The teens, two 15-year-olds and two 17-year-olds, have each been charged with armed robbery while one of the older boys was also charged with possessing a prohibited weapon.

All four will face a children's court at a later date.