Whitehall was on lockdown on Friday afternoon as police investigated a suspicious package.
The package was eventually removed and "made safe" before cordons were lifted.
Asked about the nature of the package, a Met spokeswoman said it was "far too early" to say.
The force said in a separate statement: "Police have removed a suspicious package from Whitehall.
"Specialist officers attended and made the package safe after they were informed at 3.01pm.
"The cordon has now been lifted.
"Enquiries continue.
"The public are thanked for their patience."
Whitehall is the home of numerous government departments.
