Two people were taken to hospital as a precaution on Monday after a "suspicious package" was found at the British parliament, although it was later confirmed not to be hazardous, officials said.
Police were called into the parliamentary estate yesterday after a letter was sent to a politician, believed to be Mohammad Yasin, Labour MP for Bedford.
Staff alerted police and paramedics, but the substance was found not to be hazardous.
Parliament has received four suspicious packages over the past 24 hours, The Sun's Westminster Correspondent Natasha Clark reported, citing London police.
The Met Police said they were called to Westminster just before 10am this morning to reports of another "suspicious package" in the same building as yesterday, Norman Shaw North.
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Last week, President Trump signed controversial orders imposing heavy tariffs on steel and aluminium. The UK is a notable outlier among the club of mainly rich nations which the OECD represents.
The spokesman said there were no reported injuries and inquiries were continuing.
London Ambulance Service said it had attended the scene and taken a man and a woman to a nearby hospital as "precaution".
Last month, police investigated white powder sent to an office in parliament, which was later found to be harmless.
Police are investigating a suspicious substance found on the parliamentary estate.
Cops were scrambled to an incident at Westminster this morning just hours after a similar one rocked the United Kingdom government headquarters. "The Police are investigating the content of the letters to identify any potential links". Huq, who said she was in a select committee meeting at the time of the incident, has been MP for Ealing Central and Acton since 2015.