Thai mourners wait in front of the Grand Palace to participate in a mass royal anthem singing event in Bangkok, Thailand, Oct. 22, 2016. Tens of thousands of mourners gathered around the Sanam Luang square near Bangkok's Grand Palace on Saturday afternoon and sang the Thai royal anthem in memory of late Thai King Bhumibol Adulyadej. (Xinhua/Rachen Sageamsak)

Thai mourners participate in a mass royal anthem singing event at the Sanam Luang square in Bangkok, Thailand, Oct. 22, 2016. Tens of thousands of mourners gathered around the Sanam Luang square near Bangkok's Grand Palace on Saturday afternoon and sang the Thai royal anthem in memory of late Thai King Bhumibol Adulyadej. (Xinhua/Rachen Sageamsak)