A woman has told how she was forced to prove that she was lactating by squeezing her breast at Frankfurt Airport.
Gayathiri Bose has filed a complaint with German police after she was "humiliated" by the experience.
See also: Flight attendant 'harrasses' breastfeeding woman to cover up
She said police at Frankfurt Airport were suspicious because she was carrying a breast pump but travelling without her baby.
German police told the BBC that such measures were "clearly" not part of routine procedure.
Ms Bose, who was travelling alone, said she was on her way to board a flight to Paris last Thursday when she was stopped at the security screening station.
The 33-year-old Singaporean said that after her carry-on bag, which contained her breast pump, went through the X-ray machine, she was taken aside for questioning.
When she explained that she was breastfeeding, the officers said: " Then where is your baby? Your baby is in Singapore?'," she said.
They kept her passport and she was then led to a room by a female police officer for further questioning by a female police officer interrogated Ms Bose in a private room, where she asked her to prove she was lactating.
The officer then told Ms Bose to express into her hand to prove she was lactating.
The shocked woman, travelling alone, complied.
"It was only when I came out of the room that I began to slowly understand what had just happened. I just started to cry, I was terribly upset."
Police are investigating the incident.