A swordsmanship instructor and tattoo artist accused of having a samurai sword without lawful purpose may face additional charges, a court heard on Tuesday.

Chua Teck Choon also known as Peter, 39, was back in court after his remand at the Institute of Mental Health for psychiatric evaluation.

He has been charged with having the offensive weapon at City Hall MRT station at 12.46pm on Dec 16.

Chua, who has long curly dyed hair, caused a stir when he boarded an MRT train wielding a samurai sword that day. He was then dressed partly like a Japanese martial art exponent. He was arrested eventually near Jalan Pisang off North Bridge Road.

He was apparently heading to his school near Lavender MRT station at the time. The prosecution said he may be facing additional charges of using criminal force and abusive language.

Chua, who was unrepresented, told District Judge Kessler Soh that he had a licence pertaining to the offensive weapon. He said it was with his mother, who was in court.

The judge told him to pass whatever he had to the investigation officer after he has been bailed out.

Bail of $10,000 was offered. His passport has been impounded.

The case will be mentioned again on Jan 14.

Under the Corrosive and Explosive Substances and Offensive Weapons Act, anyone found with an offensive weapon without lawful authority or for a lawful purpose in a public place, could face jail term of up to three years and given not less than six strokes of the cane.