UNIVERSITY of Hong Kong vice-chancellor Cheng Yiu-chung was unable to comment on the Robert Chung row because he could not be reached by fax while in London, a university spokeswoman said. The spokeswoman said Professor Cheng had been asked by the university's board of directors to return as soon as possible to give his version of events. Administrative assistant Polo Leung said Professor Cheng was in a London suburb and did not know of the incident until he was notified by the university on Friday. 'We called him on Friday and briefed him. He is in a remote area and can't read Hong Kong newspapers,' she said. 'We tried to fax him some newspaper cuttings but he said there was no fax machine where he was staying.' Ms Leung said the vice-chancellor had decided to cut short his holiday and would fly back to Hong Kong on the first available flight. 'He's been contacting the airline company to change the booking. We expect him to come back soon, but maybe not before Monday,' she said. Ms Leung said Professor Cheng would first study media reports before commenting on the incident. The university's student union said it might go to the airport to wait for Professor Cheng. 'We want to hear his explanation as soon as possible,' union president Chang Wan-ki said.