Both manual bamboo wood pyres and electric cremation are used for Hindu cremations. Pyres and bonfires are used in celebrations and remembrance in services. Others appropriated prepared pyres so as to have enough fuel to cremate their own dead. The Air Force dropped logs to build pyres for mass cremations of the victims. She likes smoke from incense, offerings, and cremation pyres, as these symbolize destruction. At the beginning bodies were burnt in open air pyres, later, in the camp's crematory. Traces of Bronze Age cremation pyres have also been found. The source of illumination had generally been wood pyres or burning coal. Funeral pyres were also used in Viking and Roman culture. Some or all of them may represent funerary pyres. Others have attempted to open up more outdoor funeral pyres but have faced disapproval. For Christian Death's 2003 tour, they were augmented by Cradle of Filth guitarist Gian Pyres. The most effective way was eventually found to be giant pyres on iron grills. This knowledge is a consideration for archaeologists to understand the remains from pyres. The pyres operated 24 hours a day.