AN arsonist firebombed the ICAC's operations department yesterday and escaped from the anti-corruption agency's headquarters without being seen. It was the first attack on the Independent Commission Against Corruption's offices since the body was formed in 1974. A door to the operations department on the eighth floor was set alight and burning liquid splashed into the room. Staff quickly extinguished the fire after the 1.35 pm attack in the Murray Road building. The arsonist got in and out of the building without being recorded by security cameras. The attacker apparently took the lift to the eighth floor and threw a bottle containing petrol or other inflammable liquid at the door. There are no security cameras in the building's four lifts. The security camera in the lift lobby is only for monitoring visitors wanting to enter the offices. Several crank phone calls yesterday morning were received at the department before the attack. The conversations were taped and might help in identifying the arsonist. Glass fragments from the Molotov cocktail were collected for finger-printing. Divisional Commander of Waterfront police station, Superintendent Dave Madoc-Jones, said an anonymous phone call after the firebombing claimed that there was a bomb in the ICAC lift lobby. Police found no evidence of explosives. ''The suspect did not nt'd on Page 2, Col 7) (Cont'd from Page 1) leave the lift when he threw the bottle, which hit the door and broke up,'' Mr Madoc-Jones said. ''Fire accelerant believed to be petrol then went underneath the door causing a fire. ''We have interviewed staff but information obtained was not very helpful because they could not see the arsonist.'' Deputy ICAC Commissioner and head of the operations, Jim Buckle, said security would be reviewed. ''We shall review our procedures although we are very secure. While there is room for improvement we must strike a balance between security and convenience for the public to make a report,'' he said. ''We'll be working with police to see whether this has anything to do with our current investigations,'' he said. ''But we'll be very careful not to throw open our investigations. ''We are not supposed to tell the police what we are investigating. We have a duty to protect the identity of people being investigated and anyone who makes a complaint,'' he said. Mr Buckle also confirmed his staff were receiving one or two crank phone calls a day. ''It's a common phenomenon for an investigative agency and it also happens in police stations. I know this because I had been in the police force for 25 years,'' he said. Mr Buckle said the ICAC knew most of the callers because staff who listened to their problems had been given telephone numbers and addresses. ICAC spokesman Kenneth Ko Kwan-lok said a staff member watching the security monitor in the report room saw the fire break out. At the same time, a woman staff member heard a bang and rushed out to see that the door next to the reception area was on fire. The staff club for operations officers is also situated on the eighth floor. Directorate offices and investigating sections are on the ninth floor and above that is the confidential registry and detention centre.