Six senior executives from companies that supplied building equipment to the Housing Authority were last night charged by the ICAC over bribery and falsifying purchase orders. Sources said the executives' alleged wrong-doing was exposed when graft-busters investigated the father of Canto-pop singer Eason Chan Yick-shun last year. It is understood that the ICAC investigated the six executives, from five companies, using information gathered in its bribery case against government engineer Chan Kau-tai. He was jailed for seven years in January. The ICAC last night declined to say how the six defendants were connected to Chan's case. An ICAC spokeswoman said last night the defendants - four directors, a president and a financial controller from five different Housing Authority suppliers - had allegedly offered bribes totalling $1.9 million to officers of the Housing Department. The six defendants, aged between 37 and 68, have been released on ICAC bail. They are scheduled to appear in Eastern Court this morning to face several charges of conspiracy to offer an advantage to public servants and conspiracy to falsify accounts. The alleged bribes were given so department officers would pressure contractors working on the Housing Authority's building projects to speed up negotiations with the suppliers for the purchase of services and equipment. The defendants were also accused of forging 16 purchase orders worth over $3.2 million. The fraudulent orders involved the installation and modification of electrical devices at housing projects. The bribery and falsification conspiracy is alleged to have taken place between May 1999 and January 2001. Chan was convicted of taking bribes between April 1999 and August 2001.