PORTSMOUTH, Va. (WAVY) — On October 10, Portsmouth detectives saw people armed with guns and wearing masks at the London Oaks Apartments, police said.

After detectives saw the individuals enter and exit an apartment, they were detained. A search warrant was executed for the location, and four handguns were recovered.

Two juveniles were arrested on outstanding petition and detention orders. On Oct. 11, the handguns test-fired, and two of the weapons were illegally converted into machine guns — capable of fully automatic fire, police said.

Three juveniles were charged in connection to the possession of firearms.

This is an ongoing investigation.

If you have any information about this case, you can submit an anonymous tip by calling 1-888-LOCK-U-UP, downloading the P3 tips app to a mobile device, or visiting www.P3tips.com and submitting a tip.