Police stormed the headquarters of Today's Zaman, a Turkish daily newspaper headquartered in Istanbul, late Wednesday night. The raid marks yet another government action against a Turkish media outlet.

Inspectors claim that the outlet has published opposition newspapers Ozgur Bugun and Ozgur Millet, associated with Koza-Ipek Holding, whose offices were raided in October.

Journalists and activists around the world have expressed concern about Turkey's recent crackdowns on news organizations, and say President Recep Tayyip Erdogan is eroding press freedom.

Helicopters hovered over Today's Zaman building, while riot police with a water cannon stood outside at the ready.

The newspaper, citing a lawyer on staff, said there was no court warrant to search the building, in a news story about the raid.

"It was not immediately clear why the police came to the building yet there have been rumors that the media outlet is among the targets of the government after another critical media group was seized late last month," according to the report.

Mahir Zeynalov, the newspaper's Washington Bureau chief, has been in close contact with his colleagues and told Mashable that police arrived at the headquarters in Istanbul around 9 p.m. local time prompting "chaos" in the newsroom.

"The police told our colleagues that they've a legal right to conduct a search in our offices because the newspapers are being published 'illegally,'" said Zeynalov. "At the moment, they're searching the building adjacent to our newsroom where the newspapers are being published. We do not yet know if the police are planning to search the newsroom."

Riot police outside of our newspaper. Raiding the paper is imminent. pic.twitter.com/vMAJzClgDL — Mahir Zeynalov (@MahirZeynalov) November 11, 2015

On Monday Turkish Prime Minister Ahmet Davutoglu said that freedom of Media was a redline for him - tonight Turkish Police are raiding Zaman — Amanda Paul (@amandajanepaul) November 11, 2015

The newspaper provided realtime updates throughout the raid and posted photos of police rummaging through its printing house.

It is still unclear what was seized.

Koza-Ipek Holding, the opposition media outlet that was targeted in the October raids just days before the country's general election, has ties to a movement led by Fethullah Gulen, a moderate Islamic cleric based in the U.S.

The government accuses the movement of trying to destabilize the state, and prosecutors have labeled it a terrorist organization. Wednesday's seizure is part of a wider crackdown on opposition media, which international watchdogs have called a crisis for the free press.