Two men were charged in court on Tuesday with rioting over last Saturday's attack on a full-time national serviceman at Cathay Cineleisure Orchard.
Mizra Abdul Azman, 23, and Muhammad Fahmi Razali, 20, are alleged to have been members of an unlawful assembly with three others to cause hurt to NSF Wilson Siau 20, while armed with a parang each at 9.12pm at Grange Road.
Mr Siau is in hospital with injuries to his head and hands.
The pair were remanded at Central police division for further investigation.
Police said in a statement on Monday night that nine suspects aged 20 and 22 have been arrested.
Their case will be mentioned on June 25.
The maximum penalty for rioting is 10 years jail and caning.