The Fire Services Department's promotion system faces an overhaul after the ICAC arrested 12 firefighters in connection with an alleged bribes-for-promotion and football betting racket. Anti-corruption investigators allege a principal fireman at Ma On Shan station helped his subordinates get favourable appraisals in return for benefits including a second hand car, a mobile phone and a gold bracelet. The Independent Commission Against Corruption statement said the officer - who has a maximum salary of $28,875 a month - also received $6,000 worth of floral displays to celebrate the opening of a karaoke lounge he owned in Shenzhen. Two civilians were also arrested in an ICAC operation codenamed East Wind, with two senior station officers, a station officer, a second principal fireman and seven firemen, in raids that began on Wednesday. The anti-graft inquiry centred on Ma On Shan fire station but allegedly involved officers from five other New Territories stations: Tai Po, Kwai Chung, Fu Tei, Tin Sum and Tin Shui Wai. All of those arrested were expected to have been released on ICAC bail by last night as investigations continued. Although fire chiefs insist they carry out regular reviews of the promotion system, and a previous check by the commission gave the all clear, an ICAC source said: 'It is almost certain we will be recommending a full review of the system.' It is understood that in addition to possible action under the Prevention of Bribery Ordinance, fire officials will look into whether or not the first principal fireman was in breach of civil service regulations governing the declaration of business interests. During its investigation into the alleged favourable appraisal report scam, which began last August, the ICAC said it discovered the principal fireman's supervisor, a Ma On Shan station officer, was operating a football bookmaking racket that took in bets of tens of thousands of dollars. The station officer - who can earn up to $50,055 a month - allegedly received bets from junior firemen at Ma On Shan and the other stations, leading to a probe into the possibility corrupt benefits accrued as a result. Two senior fire station officers - with a maximum salary of $59,750 - a station officer, two principal firemen, four firemen and the two civilians were arrested in connection with the bookmaking investigation. The three other firemen were picked up in direct connection with the bribes-for-promotion racket. Chief Fire Officer (headquarters) Joe Kwok Jing-keung said: 'We have always maintained a very good public image as a clean department. While we think this is an isolated incident, it has affected our image.' He said the principal officer suspected of bribery would be transferred to another section but the others would remain in their posts until they were charged. If convicted, they may face suspension.