A "suspicious" letter has been found outside a café in Copenhagen, the scene of an attack during a free speech event on Saturday.

Copenhagen’s chief rabbi has attacked Israeli prime minister Benjamin Netanyahu’s call for the “massive immigration” of European Jews to his country following the deadly shooting near the Danish capital’s main synagogue.

The suspected gunman who carried out the deadly Copenhagen attacks was a 22 year old with a history of violence and may have been inspired by the Charlie Hebdo massacre in Paris, Danish authorities have said.

Police shot dead a gunman yesterday whose attacks on a Copenhagen synagogue and an event promoting free speech may have been inspired by an attack on French satirical weekly Charlie Hebdo last month, authorities said.