SINGAPORE - One Singaporean was hospitalised and three others injured when they were attacked by over 20 men at a Malaysian nightclub on Saturday (April 10).

They were believed to have harassed the girlfriend of one of the men.

According to Chinese newspaper Shin Min Daily News, the four Singaporean men had accosted a woman at the nightclub in Johor's Kluang district. The woman's boyfriend, angered by their actions, allegedly summoned over 20 men from a secret society to beat up the four.

Five people have been arrested over the incident which happened at 3am.

The men, aged between 20 and 52 years, were arrested in Kluang on Tuesday (April 12), Malaysian newspaper The Star reported.

The Malaysian police also seized a machete, two iron rods, three rattan sticks and a baseball bat believed to have been used in the fight. They are still tracking down the other suspects.

Johor police chief Datuk Wan Ahmad Najmuddin Mohd told The Star: "We believe the incident occurred due to a misunderstanding between the customers and workers of the entertainment centre."

One of the Singaporeans, identified as Lim Yu Wei, was slashed badly and is being treated at a hospital in Singapore, Shinmin added.

Also injured were the club's manager and a waiter, who were both sent to a hospital in Kluang. The three are reportedly in stable condition.