Office in the constituency of her Minister of Finance Germany Robert Humbeck in Flensburg yesterday, Wednesday afternoon, received a package containing a white substance, which led to a large-scale police operation, reports today Spiegel.

Staff at the Flensburg office turned the case over to authorities at 3:50 p.m. local time (4:50 p.m. Greek time), who alerted firefighters, police said in a statement.

It was probably fine sand.

According to Der Spiegel, it was initially unclear what the powder was. However, after an investigation, the presence of dangerous chemicals and radioactive substances was ruled out, a police spokesman said Thursday evening.

It is believed that the dust was just fine sand, although it is not yet clear if it contained biological substances. The investigation is ongoing, he said.

Khambek’s Green Party campaign headquarters has yet to respond to a Reuters request for comment on the news.

^{According to Reuters, Der Spiegel.}