Police have arrested three youths after a break-in at Port Lincoln yesterday.

At about 6.45pm, three men allegedly forced their way into a Cronin Avenue house and assaulted two men inside the premises.

The trio also allegedly demanded drugs and money.

They fled the area, but were later caught by police.

Three 16-year-old boys, all from Port Lincoln, were charged with aggravated serious criminal trespass, assault and theft, after they took a knife from the kitchen of the house.

They were refused bail, and will appear in court today.