BANGKOK (AP) -- Thailand's crown prince was leading tens of thousands of cyclists on a 29-kilometer (18-mile) ride through Bangkok to honor his father, King Bhumibol Adulyadej, whose declining health is a matter of national concern.
Friday's event, "Bike for Dad," comes a week after Bhumibol's 88th birthday, which is a national holiday celebrated as Father's Day in Thailand. The king, who is revered in Thailand, is ailing and hasn't been seen in public in weeks.
Some 100,000 people signed up for the ride in Bangkok, with similar events being held nationwide.
It was the latest mass cycling event organized to promote Crown Prince Vajiralongkorn at a time of concern about the royal succession. He led an event in August called "Bike for Mom" to celebrate his mother Queen Sirikit's birthday.