Three ICAC officers arrested for allegedly perverting the course of justice were released on bail yesterday and told to report back to police next month. The trio were arrested in an unprecedented police raid on the Independent Commission Against Corruption headquarters in North Point on Friday. Police accuse them of coaching a witness to give false evidence in a warrant trading fraud case. ICAC officers complained bitterly in private about the police's high-profile handling of the case. But Secretary for Security Ambrose Lee Siu-kwong yesterday defended the raid and said it would not cause a rift between the police and ICAC. Lee said the case was high profile because it was widely reported by media. He believed the incident would not affect the regular direct dialogue between senior management of the two agencies - set up in 2002 after police complained about the ICAC's high-profile arrest of a senior police officer. The ICAC trio under investigation are said to have coached Cheung Ching-ho on how to testify against a warrant trader and three others to help convict them for market manipulation and money laundering. Cheung, who was charged with conspiracy to defraud in manipulation, was offered immunity in return but went back on an agreement to testify for the prosecution. His trial has been on hold since June, after he claimed to have a recording of a six-hour conversation with ICAC officers in which they coached him on his testimony. The raid was the first by police on ICAC offices since the anti-graft body was set up in 1974. It once again exposed the long-standing rivalry between the two agencies. Confrontations flared into the open in 2002 when the ICAC arrested then police senior superintendent Sin Kam-wah, deputy head of the narcotics bureau, on suspicion of accepting sex in exchange for tip-offs about vice raids. Tung Chee-hwa, chief executive at the time, stepped in. Eventually the two sides agreed to set up direct dialogue to improve co-operation.