Credit: Kevin Mazur/KCA2010/WireImage.com

Justin Bieber is pleading with fans to simmer down after his mother was trampled on by a heard of about 500 waiting to greet him as he arrived in New Zealand Tuesday.

"Finally got to New Zealand last night," the singer, 16, Twittered to his 2 million followers. "The airport was crazy. Not happy that someone stole my hat and knocked down my mama. Come on people..."

He said he wants to be able "to sign and take pics and meet my fans but if you are all pushing security won't let me. Let's keep it safe and have fun."

He joked, "I AM THE MOST DANGEROUS CREATURE HERE!!"

Luckily, his mother, Pattie Mallette, was not injured. "Thanks for all your support!!" she Twittered. "I'm ok thank you!!!"

Despite the incident, his visit was a success. He not only performed but took in some local activities, including bungee jumping off a bridge. He also got his hat back.

"NEW ZEALAND = GREAT SUCCESS," he wrote.

On Monday, Bieber scrapped a show in Sydney, Australia, after a crowd of about 5,000 teenage girls got rowdy, causing minor injuries to eight of fans in addition to others fainting.

Last month, Bieber's album My World 2.0 soared to the No. 1 spot on the Billboard charts within a week of its release.