A second teenager has been charged after police allegedly found material they believed could facilitate a terrorist attack.

A Joint Counter Terrorism Team Northern Territory (JCTT-NT) investigation was launched last month after Crime Stoppers received reports of an Australian user sharing violent extremist material online.

The investigation is a collaboration between the Australian Federal Police, Northern Territory Police, and ASIO.

On Tuesday, investigators executed a search warrants at another Darwin home and seized items of clothing, documents, electronic devices, and both controlled and prohibited weapons.

Police allege the documents and electronic devices contained material and online discussions with a “mixed ideological motivation”.

A spokesperson said it included glorification of mass casualty attacks at school.

A teenager was arrested and charged with making documents likely to facilitate terrorist attacks, which carries a maximum penalty of 10 years.

The teenager is expected to appear in children’s court on Wednesday.

It comes after another teenager was arrested and charged last week after police found multiple electronic devices and documents which allegedly contained violent extremist material and referenced violent attacks.

The teenager was charged with one count of collecting or making documents likely to facilitate terrorist acts, one count of possessing violent extremist material obtained using a carriage service, and one count of possessing or controlling firearms and explosives manufacture material obtained or accessed using a carriage service.

The charges carry a maximum penalty of 20 years.

AFP Commissioner Krissy Barrett said youths were being “manipulated’ on social media.

“Many youths want answers about contentious or polarising issues,” she said.

“So instead of asking a parent, teacher or coach, they look for answers online and are often siphoned to sites that peddle mis and disinformation, or to chat groups or platforms that are violent, racist or are misogynist.

“The simple fact is; the number of young people being investigated by our Joint Counter Terrorism Teams is increasing.

“If it used to take a village to raise a child, because of advances in technology, it now takes a country to keep them safe.

“This is not a problem law enforcement can solve on its own; this requires a whole-of-society effort.”

Northern Territory Police Commissioner Martin Dole said the arrest of a second teenager should serve as a reminder of the threats social media pose to young people.

He said it was important for parents to be aware of what youths are doing online and pay attention to changes in behaviour.

The changes can include increased distancing from loved ones, the use of hateful or emotionally charge language, developing a fixation on conspiracy theories or contentious social issues, and displaying extreme reactions to news or politics.

Investigations remain ongoing.

Anyone with suspicions of radicalisation should contact the National Security hotline on 1800 123 400 or Crime Stoppers on 1800 333 000.

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