Timmermans was sitting with colleagues on a terrace at Herengracht in Amsterdam on Sunday, October 12, around 4:45 PM when a group of men approached him. He was reportedly threatened and insulted in an aggressive tone. This also made a clear impression on those present. 
 
The police launched an investigation after Timmermans filed a complaint last week. This led to the arrest of the 32-year-old man this morning. After questioning, he was released pending his trial.