Two Berlin state ministries have been cut off from the city government’s IT network after authorities discovered a security breach.

The affected ministries — one responsible for urban development, construction and housing, and the other for mobility, transport, climate protection and the environment — have been isolated from government networks since Friday as a precaution, the Berlin Senate Chancellery said in a statement on Monday.

Officials have not said who was behind the breach, how the attackers gained access or whether any data was stolen. It is also unclear when the intrusion occurred.

“The security of the state network is the top priority,” the Senate Chancellery said. “For investigative reasons, no further specific information about the scope or background can currently be provided.”