CAIRO—Journalists and rights advocates in Egypt are renewing concerns about the contraction of freedom of expression after police arrested four Al Jazeera English journalists during a raid on the Cairo hotel suite they used as an office on Sunday, removing the last physical outpost of the Qatar-based network in the country.

The journalists, Bureau Chief Mohamed Fahmy, Peabody-award winning Australian journalist Peter Greste, freelance producer Baher Mohamed, and cameraman Mohamed Fawzy, were arrested after authorities entered their suite in the Marriott with an arrest warrant, according to Ragia Omran, an attorney representing the journalists. Fawzy was later released.

Omran said that during questioning in Cairo’s Tora Prison on Wednesday, interrogators asked Greste about his reporting in Egypt, including a report he was working on about Muslim Brotherhood-affiliated charities in a Cairo slum. (Last week the government officially declared the Brotherhood a “terrorist” organization, a designation that could shut down the movement’s massive network of social services.)

The arrests were the latest in a series of incidents highlighting the loss of freedom of expression in Egypt. Last month, a court sentenced three prominent activists to three years in prison for violating a new law criminalizing all protests that take place without explicit government permission. The new military led-government has censored three Islamist news channels, and Egyptian journalists once again speak of implicit “red lines” circumscribing what they can and cannot print. “We’re facing a problem not just with the media. Activists, citizens, anyone who is willing to speak out or do anything that is against the current regime and the current political will is going to be cracked down upon. It’s a very clear message,” Omran said.

On Tuesday, Egypt’s general prosecutor ordered the three journalists held for another 15 days while investigations proceed. According to Omran, the three are facing a range of charges, including “spreading false news” and “broadcasting externally with intention of threatening national security.” Fahmy is also accused of belonging to the Muslim Brotherhood, which is now branded a terrorist organization. The charges against Baher Mohamed have not yet been confirmed, Omran said.

Jared Malsin is a freelance journalist based in Cairo