Three top Russian dailies on Monday published the same front page in an unprecedented act of solidarity over the arrest of an investigative reporter on drugs charges.

“I am/we are Ivan Golunov,” the Kommersant, Vedomosti and RBK newspapers declared in giant letters on their front pages.

Golunov, a 36-year-old investigative reporter with Meduza, an independent Russian-language media outlet, was detained last week over allegations that he manufactured and dealt drugs.

His arrest sparked outrage among Russian journalists and supporters who say the charges against him are a punishment for his reporting.

Golunov faces between 10 and 20 years in prison if convicted.

In identical statements published on their front pages, the three newspapers said Golunov’s prosecution was an act of intimidation against Russian society and demanded an investigation into the policemen who had detained him.

“We demand that the law be observed by everyone and for everyone,” they said.

Golunov was released from pretrial jail at the weekend and placed under house arrest after hundreds of supporters gathered outside a Moscow courtroom.

The three newspapers said they welcomed the more lenient pretrial conditions but said they did not consider the evidence presented by investigators to be convincing.

“We do not rule out that Golunov’s detention and subsequent arrest are linked to his professional activities,” they said.

All three newspapers are privately owned but increasingly have to toe the government line.

During his two decades in power, President Vladimir Putin has silenced most of his critics and muzzled the media. The few opposition and independent media that still operate in Russia are under huge pressure, Kremlin critics say.

Golunov has been charged with attempted dealing of a “large amount” of designer drug mephedrone and cocaine.

His lawyer and supporters pointed to egregious violations in his case.

Police released pictures of a drug laboratory that Golunov allegedly ran but later admitted that only one of the photos was taken in the journalist’s apartment.

The Meduza website is based in European Union member state Latvia to circumvent censorship from Moscow, but some of its journalists live in Russia.

Golunov’s detention has prompted statements of concern from the European Union, the United States, the OSCE [Organisation for Security and Co-operation in Europe] and the Council of Europe, among others.

Since Friday, Russians have held one-person pickets in front of Moscow’s police headquarters — the only form of protest that does not require prior approval from Russian authorities.