Package with white powder delivered to British Parliament

LONDON, ENGLAND - FEBRUARY 01: The Houses of Parliament stand on the banks of the River Thames on February 1, 2018 in London, England. MPs have voted to leave the Palace of Westminster in the next decade as £3.5bn of restoration work is carried out on the building to improve fire safety. (Photo by Jack Taylor/Getty Images)

LONDON — London police say a suspicious package that was delivered to the British Parliament building contained a white powder.

The Metropolitan Police said specialists are assessing the powder. Authorities didn’t identify the office that received the substance on Tuesday, but said it remains closed.

Police say the rest of the parliamentary complex in central London is open.

Police counterterrorism detectives are investigating the incident. The complex was not evacuated or placed in a lockdown.