Police in Australia raided the headquarters of national broadcaster ABC in connection with a series of stories it ran in 2017 on accusations of unlawful killings committed by Australian special forces in Afghanistan.

The operation on Wednesday came just a day after police raided the Canberra home of News Corp Australia journalist Annika Smethurst about a report that detailed the authorities’ bid to gain powers to spy on citizens’ communications at home.

ABC executives said police searched the corporation’s offices in Sydney, targeting three journalists involved in the broadcaster’s two-year-old investigative report, known as The Afghan Files.

In 2017, ABC obtained government documents showing Australian special forces had killed innocent men and children in Afghanistan.

The Australian Federal Police said the search was “in relation to allegations of publishing classified material, contrary to provisions of the Crimes Act 1914”.

ABC Executive Editor John Lyons said the search warrant demanded access to reporters’ handwritten notes, emails, story drafts, footage and passwords, among other things.