A bomb exploded outside the offices of national daily Jang in Quetta, Baluchistan, western Pakistan blowing out windows in neighbouring buildings.
No-one was injured in the blast at the Urdu-language conservative daily on 24 February.
"It is disturbing that some armed groups consider the media to be military objectives," said Reporters Without Borders after the daily’s office manager Javed Iqbal said that he had no doubt that Jang was the target of the bomb attack, a view shared by staff and by the police.
"We fear that such acts are intended to silence journalists covering news in this province bordering Afghanistan", the international press freedom organisation said.
A journalist in Quetta said the separatist Baluchistan Liberation Army had reportedly admitted responsibility for the bombing.