Body found in Belanglo State Forest

The victim was celebrating his 18th birthday when he was killed, the ABC reports.

Two teenagers have been charged over the murder of another teenager killed over the weekend in NSW's Belanglo State Forest, scene of the gruesome backpacker killings of the early 1990s.

Three teenagers were arrested after the grisly discovery off a dirt road in the bushland south of Sydney at 8.30pm (AEDT) on Sunday.

Police found the body, which was shallowly buried and covered in debris, after a tip-off.

At about 7.30am on Monday, a 17-year-old boy was arrested at Bargo in the NSW Southern Highlands and later charged with murder. He was refused bail and is scheduled to appear at Campbelltown Children's Court today.

An 18-year-old man was arrested at nearby Bowral at about 11pm on Sunday. He was charged today with accessary after the fact to murder and was refused bail to appear at Picton Local Court later in the day.

Another 18-year-old man was arrested at Bargo at about 9.15am and charges are expected to be laid.

Read more here Milat relative charged.