Temple rabbi Emanuel Michael Schadick arrived Sunday morning around 8 am and found some disturbing posters. One of them had a picture of Hitler with the words "Did you forget about me?" The other said, "A crusade against Semites led subhumans."
The posters were credited to the Vorherrschaft Division, an extremist Nazi group.
No arrests have been made so far and there are currently no definitive indications, Sergeant. John Wittkowski of the Grand Rapids Police Department told CNN. The investigation is being conducted by the serious crime detective unit.
Wittkowski said the incident was believed to have occurred between 8 pm on Saturday and 8am on Sunday. He said the synagogue is in a "relatively quiet" residential neighborhood.
Temple Emanuel has increased its private security and members and staff are more vigilant after the hateful images have been discovered, Wittkowski said. Police also increased patrols in the area.
CNN called Temple Emanuel and sent an e-mail to the synagogue president, but has so far been unable to find a representative to comment on.
The posters were discovered on the day Sukkot, the week-long Jewish festival of thanksgiving for the autumn harvest, began.
Local leaders and officials condemned vandalism and shared messages of solidarity with the synagogue and the Jewish community.
"Hate has no place in our community and will not be tolerated," said Eric Payne, chief of police at Grand Rapid. CNN WXMI Affiliate"This act of hatred has no place here or anywhere," Rep. Justin Amash, whose district includes Grand Rapids, wrote in a tweet. "The diversity of Grand Rapids is a blessing that makes our community stronger and more beautiful. We are united against any efforts to harass or intimidate the Temple Emanuel congregation or any of our Jewish brothers and sisters." Grand Rapids Mayor Rosalynn Bliss wrote on Twitter that she was "in solidarity with our Jewish friends and neighbors. And united in the rejection of these acts of hatred and anti-Semitism." Jewish communities in the US experienced near-historical levels of anti-Semitism in 2018, according to an annual report by the Anti-Defamation Alloy. There were 1,879 attacks on Jews and Jewish institutions last year, the third largest since the organization began tracking this data, ADL said. .