Turkish police on Tuesday have detained 11 suspects linked to the attacks on newspapers Yeni Safak and Yeni Akit in February.
Istanbul police’s anti-terrorism and intelligence branch has carried out operations in 20 different locations across the city.
A number of organisational documents and digital material were seized.
The suspects are allegedly members of The United Freedom Forces (BOG) - a militia that was founded in the Syrian Kurdish town of Kobane.
The group BOG reportedly cooperates with PYD and MLKP both of which are considered terror organisations by Turkey.
Early morning on Feb. 11, the Istanbul offices of the Yeni Safak and Yeni Akit were simultaneously attacked by masked assailants who threw molotov cocktails and fired pump-action shotguns into the walls of the building.
There were no casualties in either attack.