Four youths allegedly robbed a Katherine service station armed with a knife and spear, while four youths, one 11-years old, have been charged over break-ins in Tennant Creek, NT Police said.

NT Police media manager Margaret McKewon said in a statement police were calling for information after four males, believed to be youths, allegedly walked into a service station on Katherine Terrace, Katherine South, armed with a knife and spear about 11pm Sunday night.

She said they allegedly threatened an employee before stealing two tills and fleeing with police later finding the tills abandoned.

Police did not say how much money was allegedly stolen.

While four young people aged 11, 12, 14 and 17, of unspecified gender, were arrested at unspecified times across the weekend in Tennant Creek over a break-in of an Ambrose St house, and criminal damage and trespass at a business on Peko Rd, Ms McKeown said.

Police did not say when the crimes were alleged to have been perpetrated.

She said the 11-year-old was charged with trespass of an enclosed premises, and criminal damage while the 12-year-old was charged with trespass of an enclosed premises, criminal damage, aggravated unlawful entry, and stealing.

While the 14-year-old and the 17-year-old were charged with aggravated unlawful entry and stealing, and all were bailed to appear in court on May 22.

If you have any information you can call police on 131 444, or Crime Stoppers anonymously on 1800 333 000.