Labor activist Davood Razavi told RFE/RL’s Radio Farda that some 23 protesters were detained.

He said the crackdown demonstrates the lack of tolerance of the Iranian government for even a small form of dissent.

“The drivers wanted to distribute flowers and cookies,” said Razavi in a telephone interview from Tehran. 

Ebrahim Madadi, a senior member of the Union of the Workers of Tehran and Suburbs Bus Company, is among those detained.  

He was reportedly beaten up and transferred to an unknown location.