A boy runs next to a portrait of Thailand's King Bhumibol Adulyadej, placed in celebration of the King's 88th birthday, in Bangkok, Thailand, December 5, 2015. (Photo by Jorge Silva/Reuters)





Supporters of Thai King Bhumibol Adulyadej sit outside Siriraj hospital, where a group has gathered to mark his 88th birthday, in Bangkok December 5, 2015. (Photo by Jorge Silva/Reuters)





A supporter of Thai King Bhumibol Adulyadej prays outside Siriraj hospital, where a group gathered to mark his 88th birthday, in Bangkok December 5, 2015. Thais marked the birthday of King Bhumibol Adulyadej, the world's longest-reigning monarch, early on Saturday, by giving alms at temples around the country. Celebrations in Thailand, where the monarch's birthday is also national Father's Day, come amid a widening police investigation into a group of people charged with insulting the monarchy. The king has spent the past few months at the hospital being treated for hydrocephalus. (Photo by Jorge Silva/Reuters)





A banner with pictures of Thai King Bhumibol Adulyade hangs at Siriraj hospital, where he has spent the past few months being treated for hydrocephalus, on his 88th birthday in Bangkok December 5, 2015. (Photo by Jorge Silva/Reuters)





A band plays in honor of Thailand's King Bhumibol Adulyadej as people gather to mark his 88th birthday, in Bangkok December 5, 2015. (Photo by Jorge Silva/Reuters)





Supporters of Thailand's King Bhumibol Adulyadej look at his hospital bedroom as they pray outside Siriraj hospital, where a group gathered to mark his 88th birthday, in Bangkok December 5, 2015. (Photo by Jorge Silva/Reuters)





Supporters of Thailand's King Bhumibol Adulyadej look at his hospital bedroom as they pray outside Siriraj hospital, where a group gathered to mark his 88th birthday, in Bangkok December 5, 2015. (Photo by Jorge Silva/Reuters)





A boy walks in front of a picture of Thailand's King Bhumibol Adulyadej hanging from a public building to mark his 88th birthday, in Bangkok December 5, 2015. (Photo by Jorge Silva/Reuters)





A supporter of Thailand's King Bhumibol Adulyadej holds a portraait of him outside Siriraj hospital, where a group gathered to mark his 88th birthday, in Bangkok December 5, 2015. Words on portrait read, "Long live the king!". (Photo by Jorge Silva/Reuters)




Army officials hold lit candles as they gather to celebrate Thailand's King Bhumibol Adulyadej 88th birthday, in front of Grand Palace in Bangkok, Thailand, December 5, 2015. (Photo by Jorge Silva/Reuters)





Thousands of people gather in front of the Grand Palace as they celebrate the birthday of Thailand's King Bhumibol Adulyadej to mark his 88th birthday in Bangkok, Thailand, December 5, 2015. (Photo by Athit Perawongmetha/Reuters)





Army officials and guests pose after attending the official ceremony to celebrate Thailand's King Bhumibol Adulyadej 88th birthday in Bangkok, Thailand, December 5, 2015. (Photo by Jorge Silva/Reuters)





Children play next to a portrait of Thailand's King Bhumibol Adulyadej, placed in celebration of the King's 88th birthday, in Bangkok, Thailand, December 5, 2015. (Photo by Jorge Silva/Reuters)





Army officials and guests pose after attending the official ceremony to celebrate Thailand's King Bhumibol Adulyadej 88th birthday in Bangkok, Thailand, December 5, 2015. (Photo by Jorge Silva/Reuters)