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.”

The information on the laptop cannot be remotely erased, sources said.

Other items stolen include “sensitive” documents, an access keycard, coins, a black zippered bag with the Secret Service insignia on it and Secret Service lapel pins from various assignments — including ones involving Donald Trump, the Hillary Clinton campaign, the United Nations General Assembly and the Pope’s visit to New York, sources said.

Some items, including the coins and bag, were later found. But other items, including the laptop, were still being sought.

“The U.S. Secret Service can confirm that an employee was the victim of a criminal act in which our Agency issued laptop computer was stolen,” Secret Service spokesman Shawn Holtzclaw said in a statement.

“Secret Service issued laptops contain multiple layers of security including full disk encryption and are not permitted to contain classified information. An investigation is ongoing and the Secret Service is withholding additional comment until the facts are gathered.”

The agent, Marie Argentieri, could not be reached for comment.

The thief stepped out of a dark-colored car, possibly an Uber, and stole the laptop from Argentieri’s vehicle, a 2015 Bajaj, which was parked in the driveway of her Bath Beach home, sources said. Neighbors said the thief struck about 3 a.m.

The crook, a man dressed in black, didn’t get back in the car. He was seen on surveillance video walking away from the scene with a backpack holding the laptop, sources said. READ MORE