Police have seized tapes of security cameras around Happy Valley racecourse in an attempt to find clues about the remote-controlled dart-firing device found buried in the racetrack on Wednesday.
Although the area near where the device was uncovered is not monitored by cameras, a police source said investigators were examining footage from security cameras that covered other areas, including the entrance of the public areas beside the racetrack.
The device was made of 12 tubes linked with wires and connected to a compression and remote-controlled apparatus.
'It is a homemade device, but sophisticated and complicated,' the source said. 'We are waiting for the results of examinations [from government laboratory and bomb disposal specialists] to find out how it works and what its intended purpose was.'
The source admitted that there had been no breakthrough in the case, saying that 'we have made very little progress'.
During an inspection, Jockey Club tracks supervisor Jackson Wong Chak-shuen found the device hidden under the turf where the 1,200-metre starting gates would have been placed for Wednesday.