Amsterdam evacuation after bomb threat

Police have evacuated Amsterdam's main square after a bomb threat at an upmarket department store.

Police have evacuated Amsterdam's main square after a bomb threat at an upmarket department store. (AAP)

Dutch police have evacuated Amsterdam's main Dam Square, where one of the royal palaces is situated, because of a bomb threat.

"Following a bomb threat at the upmarket Bijenkorf department store, the building on Dam Square has been evacuated," police said in a tweet.

"The Bijenkorf and surrounding areas have been emptied," they added.

A police helicopter has been deployed along with extra police, Dutch media said.