In a letter written to his solicitor towards the end of September 1960, Werner makes reference to ‘sad occurences’ in Cologne, which, as the letter progresses, have clearly angered him as much as they may have saddened him:

"In view of the sad occurrences in Cologne and other places, which have taken place, I have completely lost faith in any credibility of German officialdom."

I consulted a number of sources to try to find out what these events were, and it seems that the Cologne synagogue and the memorial to victims of Nazism had been vandalised. The synagogue was daubed with a swastika and with the words “Juden raus” (Jews out). Swastikas were also painted on park benches in Brunswick. At Gelsenkirchen, a swastika was painted on the facade of a Catholic church.

Meanwhile, federal officials reported that at Offenbach an anonymous letter had been sent, threatening 85-year-old Isaac Hamburger.

According to Haaretz:

"On December 24, 1959, a synagogue in Cologne, West Germany, was daubed with a swastika and the words “Juden raus” (Jews out). Coming less than 15 years after the end of the Holocaust, this expression of anti-Jewish hatred in Germany was noted internationally, even though the physical damage was minor. What made the incident especially noteworthy – even shocking – however, is the fact that it was followed by a veritable flood of similar anti-Semitic acts, in countries around the world. Over the next few weeks, synagogues and Jewish community buildings from New York to Vienna, and London to South Africa, were subject to acts of vandalism, and Jewish community buildings and individuals in places as far-reaching as South Africa and South America were vandalized or threatened.
The Roonstrasse synagogue in Cologne had only reopened to the public two months earlier, after a two-year process of reconstruction. Originally built in 1899, the neo-Romanesque Roonstrasse was one of five Cologne shuls destroyed by the Germans during Kristallnacht, November 9-10, 1938, when Jewish-owned businesses and community structures across Germany were subject to a wave of attacks, and hundreds were killed. The dedication of the rebuilt synagogue had been attended by West German Chancellor Konrad Adenauer. The day after the vandalism, on December 25, 1959, two young men were apprehended for defacing the Cologne synagogue. Both turned out to be members of the right-wing Deutsche Reichs party, which immediately disavowed both them and their actions. In early February the men were quickly put on trial, which they used as an opportunity to make anti-Semitic speeches.
Within a week of the Christmas Eve incident in Cologne, a spate of similar acts were reported around West Germany: swastikas were painted on the Monument to Victims of Nazism, in Brunswick, and on the front of a Catholic church in Gelsenkirchen. In Offenbach, an 85-year-old Jewish man received a threatening letter. There were also reports of attacks in East Germany ... According to the Vidal Sassoon International Center for the Study of Anti-Semitism, during the first months of 1960, nearly 2,500 anti-Jewish actions were reported as taking place in 400 different locations globally, most of them desecrations of synagogues or cemeteries".

The Association of Jewish Refugees (AJR) also wrote on these events in February 1960, including a piece on reactions in the UK:

“The anti-semitic incidents in Germany, this country and other parts of the world have been widely reported and commented on in the national press as well as on sound and television broadcasts. 

A silent protest march to the German Embassy in London, organised by the Association of Jewish ex-Service Men and Women took place on Sunday, 17th. It is estimated that approximately 35,000 persons (about one-third of them non-jews) took part”.