KUALA LUMPUR, Malaysia -- Malaysia's tourism minister is trying to assure tourists that an attack by gate-crashers at the wedding of a Brazilian couple was an isolated incident.

The wedding, attended by 90 guests, was held Oct. 15 on Rawa, a popular resort island off southern Johor state. Six men crashed the party and began attacking the guests with golf clubs and sharp objects. The groom suffered bruises on his face and neck.

Police arrested four men, including a 19-year-old member of the Johor royal family.

Officials fear the incident could hurt tourism, which is Malaysia's second-largest foreign exchange earner after manufacturing.

"We are truly shocked to hear that this has happened in a Malaysian tourist resort island," Tourism Minister Leo Michael Toyad said in a statement.

He conveyed his apologies and added, "This unfortunate incident is an isolated case and Malaysia remains a safe place for tourists."