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Katrin Lompscher (archive image)
Photo: Corinna Schwanhold / dpa
The public prosecutor's office is investigating the former Berlin building senator Katrin Lompscher.
The proceedings are about the suspicion of a tax crime, said the Berlin authority spokesman Martin Steltner.
The RBB had previously reported.
The dpa news agency reported that she could not reach Lompscher on Thursday.
The left-wing politician resigned from her post as senator at the beginning of August.
She justified the step with errors in the accounting and taxation of her remuneration from activities as an administrative and supervisory board member of state-owned companies.
For years she had failed to repay remuneration for supervisory board positions in state-owned companies as prescribed to the state treasury, Lompscher had explained at the time.
It is about a shortfall of 7,000 euros.
"I am personally responsible for the omissions and I apologize for them," wrote the 58-year-old at the time.
"I assure you that I did not act with intent."
A particular level of responsibility is expected from political decision-makers.
"I have not lived up to this responsibility and I apologize to the citizens of Berlin."
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mes / dpa