A version of this post originally appeared on iranhumanrights.org and is published here in collaboration with the International Campaign for Human Rights in Iran.

Security forces arrested prominent Iranian cartoonist Hadi Heidari in his office at Shahrvand newspaper in Tehran on November 16, 2015. Two co-workers of Heidari at the Tehran daily confirmed the arrest and told the International Campaign for Human Rights in Iran that “a young man came with a warrant. He showed Hadi the warrant and they took him quietly.”

The sources told the Campaign that they were not certain which organization arrested Heidari, but added that he was likely arrested by the Intelligence Organization of the Revolutionary Guards, a powerful branch of the country's armed forces responsible for maintaining the country's Islamic system. Heidari’s last cartoon was related to the attacks in Paris on November 13, which left 130 people dead.

Hadi Heidari, 38, is a graduate of Tehran’s Arts and Architecture University with a degree in painting. For the past 20 years, he has worked in various reformist publications in Iran, including Etemad, Bahar, Pool, Norooz, Neshat, Asr-e Azadegan, and Eghbal, among others.

Heidari was previously arrested in 2009 in the aftermath of that year's disputed presidential election on charges of “assembly and collusion against national security,” and spent 17 days in detention before release. He was again arrested in December 2010 on charges of “propaganda against the state,” and was released two months later on bail of about $15,000.

In September 2012, a cartoon by Heidari titled “The Blindfolded Men” for Shargh newspaper became highly controversial. Following its publication and a concerted effort by 150 members of parliament, state authorities, and clerics, Shargh was banned on September 26, 2012, a day after the cartoon was published, and Heidari was summoned to court. Mehdi Rahmanian, the newspaper’s manager and license holder, was transferred to the notorious Evin Prison.

The authorities who objected to the cartoon stated that it was an insult to Iran-Iraq War veterans, but many believed this to be a mere excuse for banning the reformist newspaper in which it was published. The newspaper and Heidari were eventually acquitted of the charges on December 29, 2012, and Shargh resumed publication.

During recent weeks, several Iranian journalists have been arrested by the Revolutionary Guard Intelligence Organization, in what has become an intensifying crackdown by hardliners. Ehsan Mazandarani, managing director of Farhikhtegan newspaper, Afarin Chitsaz, columnist for Iran Newspaper, Saman Safarzaei, the international editor of Andisheh Pouya publication, and Issa Saharkhiz, political activist and journalist, are some of the recent detainees whose arrests have been confirmed by the Revolutionary Guards.