Attempts were made six times to hack the digital video recorder connected to the CCTV sets on the Banani building where 47-year-old Chinese businessman Gao Jianhui was killed on December 10 and it was found disconnected when the police lunched their investigation.
Gao was kept buried at the backyard of the building after he was murdered.
An IT official of the Suvastu Properties, Jakir Hossain, said that he reached the building on information at about 11:15am on December 10 and found the DVR adaptor disconnected.
‘None informed us that the connection of the CCTV cameras was snapped,’ said Jakir.
Police investigators came later and conducted their examinations.
They found that not only the DVR was disconnected but also attempts had been made six times to penetrate the DVR, Jakir told New Age on Friday.
There are eight CCTV cameras on the building. Four of those are on the ground floor while another covers the backyard, security personnel of the building said.
Jakir said that the CCTV camera pointed at the backyard was also found disconnected.
The police investigators continued their investigation with at least six people in their custody.
Banani police station inspector (investigation) ABM Asaduzzaman said that it would have been easier for them to identify the suspects if they had CCTV footage.
The police station’s officer-in-charge Nure Azam Miah said that they had interviewed Gao’s wife, who arrived in Dhaka on December 12, and a female business partner of his about the killing and the investigation was going on based on information they gave.
Following the killing, the Gulshan crime division and detective branch of the police have been interrogating at least six persons of the building in connection with the murder.
They are security supervisor Lavlu Ahmed, security guards Joy Nandi, Md Imran and Abdur Rouf, and Gao’s manager Rajib and driver Sultan Khan.
Police investigators said that they were not arrested but kept for interrogation.
Nure Azam said that they were taken by the DB officials on Friday for further interrogation.
The investigators were yet to arrest any suspect after the Chinese company SUMEC’s liaison office country manager Zhang Shu Hong on Wednesday filed a case with the Banani police station against ‘some criminals’.
Police personnel were seen deployed at the building on Friday and Gao’s wife left the house for Uttara.
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