A laptop computer containing floor plans for Trump Tower, information about the Hillary Clinton email investigation and other national security information was stolen from a Secret Service agent's vehicle in Brooklyn, police sources told the Daily News.

Authorities have been frantically searching for the laptop since it was stolen Thursday morning — and are trying to determine if the thief knew what he was taking or randomly targeted the agent’s vehicle.

NYPD cops were assisting in the investigation but had scant information on exactly what’s on the laptop, sources said.

"The Secret Service is very heavily involved and, citing national security, there's very little we have on our side," a police source said. "It's a very big deal.”

"There's data on there that's highly sensitive,” the source said. “They're scrambling like mad.”