In an unusual Facebook post(s fb), Mark Zuckerberg blasted President Obama on Thursday over controversial hacking tactics used by the NSA in the name of national security.

“When our engineers work tirelessly to improve security, we imagine we’re protecting you against criminals, not our own government,” wrote Zuckerberg, adding, “I’ve called President Obama to express my frustration over the damage the government is creating for all of our future.”

The harsh words are likely related to leaked documents published yesterday that suggest the NSA has been instructing its computers to pose as Facebook servers in order to inject malware into people’s computers in order to spy on them.

The leaks are the latest in a series of highly classified documents released by former NSA contractor Edward Snowden that have exposed how the NSA is using phone carriers and major tech companies to amass data and carry out espionage activities.