During Justin Bieber's concert on Mother's Day in Johannesburg, South Africa, criminals reportedly working hard backstage pulling off an elaborate heist.

According to the local Eyewitness News, a group of suspects executed an Ocean's 11- type stunt involving ropes and all lowering themselves into the safe room at the FNB stadium where they made it out with the night's concert earnings which is approximately $330,000 cash. 

The suspects managed to pull off the heist AND even went unnoticed until Monday morning. That is when the stadium management and concert promoters were made aware of the incident. 

Police, forensic experts and security company officials placed the stadium on lockdown later Monday to investigate. 

The Boyfriend singer jokingly tweeted: 

(Photo courtsey of Perez Hilton) 

Minutes later the tweet was gone but thanks for clarifying Biebs ;)