"We have received bomb threats and threats via e-mail," said the president of the Stockholm Jewish Community, Lena Posner-Körösi.
On Friday, police was contacted, and the security precautions were increased straight away.
"In the current situation we have increased surveillance of around 10 locations in central Stockholm, which includes Jewish activities," said Fredrik Näslund of the Stockholm Police.
According to Lena Posner-Körösi, the threat level against the Jewish communities in Sweden have increased gradually over the last decade. "We are used to Malmö being extra vulnerable, but now it is as bad in Gothenburg and Stockholm," Posner-Körösi told the news agency TT.
She is certain that it was not a coincidence that the female police officer who was shot down in Paris last week, was patrolling outside a Jewish school, not that the attacker
"There is a logic to the sickness, but we must not back down, and give in to evil forces," she said.