A colleague of Thomas Cheung presents a helmet used by Thomas during his funeral held at the Universal Funeral Parlor in Hung Hom in south China's Hong Kong, July 17, 2016. An official police funeral with full honor was held here Sunday for Thomas Cheung, a 30-year-old senior station officer who died while battling fire in an industrial building in Hong Kong's East Kowloon on June 25, 2016.(Xinhua/Wang Shen)

A colleague of Thomas Cheung holds a helmet used by Thomas during his funeral held at the Universal Funeral Parlor in Hung Hom in south China's Hong Kong, July 17, 2016. An official police funeral with full honor was held here Sunday for Thomas Cheung, a 30-year-old senior station officer who died while battling fire in an industrial building in Hong Kong's East Kowloon on June 25, 2016.(Xinhua/Ng Wing Kin)

Colleagues of Thomas Cheung salute to pay their last tribute to him during his funeral held at the Universal Funeral Parlor in Hung Hom in south China's Hong Kong, July 17, 2016. An official police funeral with full honor was held here Sunday for Thomas Cheung, a 30-year-old senior station officer who died while battling fire in an industrial building in Hong Kong's East Kowloon on June 25, 2016.(Xinhua/Ng Wing Kin)

A hearse carrying the coffin of Thomas Cheung pulls out of the Universal Funeral Parlor in Hung Hom in south China's Hong Kong, July 17, 2016. An official police funeral with full honor was held here Sunday for Thomas Cheung, a 30-year-old senior station officer who died while battling fire in an industrial building in Hong Kong's East Kowloon on June 25, 2016.(Xinhua/Wang Shen)

Colleagues of Thomas Cheung salute to pay their last tribute to him during his funeral held at the Universal Funeral Parlor in Hung Hom in south China's Hong Kong, July 17, 2016. An official police funeral with full honor was held here Sunday for Thomas Cheung, a 30-year-old senior station officer who died while battling fire in an industrial building in Hong Kong's East Kowloon on June 25, 2016.(Xinhua/Ng Wing Kin)

Colleagues of Thomas Cheung offer roadside mourning service on the route of his funeral in south China's Hong Kong, July 17, 2016. An official police funeral with full honor was held here Sunday for Thomas Cheung, a 30-year-old senior station officer who died while battling fire in an industrial building in Hong Kong's East Kowloon on June 25, 2016.(Xinhua/Ng Wing Kin)