The Duke and Duchess of Cambridge's otherwise picture-perfect tour Down Under was marred today by two men who were detained for allegedly acting aggressively as the royals paid a visit to the Blue Mountains in Australia.

READ MORE: Prince William and Kate Bring Prince George to Australia

The two men, ages 21 and 37, were stopped and searched by police after they allegedly harassing fellow royal-gawkers in the village of Winmalee as they awaited William and Kate's arrival, according to Australian newspaper The Daily Telegraph.

The men were later released and not charged but moved from the area where William and Kate's motorcade was set to arrive, the Daily Telegraph reports.

PHOTOS: All the Best Photos of William, Kate and George Down Under

William, 31, and Kate, 32, arrived to the Blue Mountains range by helicopter today, which is day two of their visit to Australia. The range, west of Sydney, is one of the country's most scenic sites and was nearly destroyed by bushfires a few months ago.

The royal couple met with first-responders and fire survivors, planted a tree and did their own bit of sightseeing, which included William's giving his wife, and all those watching, a scare.

Kate Middleton Beats Prince William in Sailing Race

The prince, a former Royal Air Force helicopter pilot, peered dangerously over the edge of a steep cliff as the couple stood atop the mountains' Narrow Neck Lookout.

"He took a bit of a lunge and a few people held their breath, gasped and readied their hands to grab him," Damien Cooper, manager of the Blue Mountains Youth Service, told the Daily Telegraph. "He was fine, of course. He knew what he was doing. I think his military background prepared him well for it."

Not on hand for his dad's perilous glimpse over the cliff was the couple's son, 8-month-old Prince George.

The young prince, who has been a star of the family's first official overseas trip together, may make an appearance this weekend at the Sydney Zoo.

His mother, Kate, however, reportedly told one young girl today that Prince George is very cute but very loud and likely to scare the animals at the zoo.