Two people have been taken to hospital as a precaution as police cordoned off an area of Parliament to investigate a "suspicious substance".
A suspicious substance was in Westminster was later deemed non-hazardous, authorities said.
A suspicious substance sent to a building at the British parliament was found to be non-hazardous, a spokesman for parliament said on Monday.
The package was later described as a letter which contained a white powder, which has been assessed by specialists and found not to be noxious, the Metropolitan Police said.
"The affected area was temporarily cordoned off but no evacuation was necessary".
The office of opposition Labour MP Mohammad Yasin received the item, while he was not in the room, according to a member of his staff. "We can not provide any more details at this stage", a parliamentary spokesperson said.
'London Ambulance Service attended and two people, a man and a woman, have been taken to hospital as a precaution, ' they said.
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