A Sydney teenager is in jail after allegedly posting a plan to commit a terrorist act on Facebook, police report.

The boy, 17, is said to have posted a number of frightening statuses including an “attack map” targeting four locations in Sydney, according to a report in Fairfax Media.

“[I will] whip out my blade and start slashing every man and woman, even a child, around me,” and “its (sic) going to happen tomorrow morning, 10-11am AEST”, he allegedly posted on June 14.

He also added he planned to take his own life after, “but as long as it’s over 25, 50 than Ill (sic) be happy”.

The boy was arrested the following day, charged with one count of acting in preparation for, or planning, a terrorist act, and one count of using a telecommunications network with the intention to commit a serious offence.

Further details of his social media posts were revealed during a bail application in August at the NSW Court of Criminal Appeal.

The teenager, who has been diagnosed with depression and Aspergers syndrome and is of Greek background, reportedly wrote a number of threatening posts earlier this year.

“I can get a real long sharp knife and just curt up and kill as many people that I can under a minute,” he allegedly wrote on May 23.

“If I were to do this it would be the most far worst bloody massacre ever to happen in Australia since the Port Arthur massacre,” another post said.

But the boy told police the posts were his way of seeking attention.

“I could never hurt anybody, not in my life…I just wanted to get my own slice of attention for once. I just, because I’m so ignored all of the time by everybody,” he said in an interview.

He said he wrote the posts, “To make a statement about mental health and bullying. This has nothing to do with ISIS, I’m not religious”.

But a fact sheet written by the NSW Joint Counter Terrorism Team reports the teenager has previously participated in other suspicious activity online.

Going by the name Lonewolfhunter200 he allegedly accessed a website and asked, “How to organise a terrorist attack without authorities knowing?”

It is also said he searched how to make a fire bomb.

Judges decided there was an unacceptable risk to the community if the teenager is granted bail.

“Perhaps the most disturbing aspect of the posts on Facebook is that they took place over a significant period of time, i.e 23 May – 12 June 2016,” Justice Clifton Hoeben said in a judgment.

“These do not appear to have been spur of the moment thoughts but rather to have been based on or driven by some deep-seated feelings of hostility which the applicant was experiencing at the time.”