A deadline for Justin Bieber to reclaim 

his pet monkey has passed 

Mally, a 17-week-old capuchin monkey, was seized by customs staff at Munich's Franz Josef Strauss Airport after the singer failed to produce the correct papers for the animal.

The Canadian star was detained "for some time" while customs officials took Mally into quarantine at the airport.

Mally was sent to a Munich Animal Protection League (MAPL) animal shelter, where he has remained unclaimed since March 28.

Customs officials said that if Bieber did not produce the papers by midnight on May 17 then Mally would become the property of Germany.

The deadline fell after offices closed for a three-day holiday weekend in Germany, and it will not be clear before Tuesday whether the documents arrived.