Reacting to the news, anti-Islamophobia group director Iman Atta OBE told the Sun: "Those behind the malicious letters are trying to create fear within the Muslim communities and the threatening letter titled "Punish a Muslim Day" may be part of a wider campaign of hate against Muslims".
Just last month Amber Rudd had white powder sent to her office in Parliament, and police deployed counter-terror officers to look into it. On Monday, two staff members from Yasin's office had also been briefly hospitalised as a precautionary measure.
Parliament has received four such packages over the past 24 hours, police told Business Insider.
The packet found today was delivered to Rupa Huq's office.
"These letters are nothing short of a sick and cowardly attempt to divide our communities", Labour's Rosena Allin-Khan said in the debate following Qureshi's question.
Huq posted a photograph of the letter, which urges people to hold a "punish a Muslim day on April 3" and perform anti-Muslim acts ranging from verbal abuse, physical attacks, murder and setting fire to mosques.
Labour leader Jeremy Corbyn called the letters "utterly contemptible" called for unity against "vile Islamophobia".
"Two people have been hospitalized as a precaution after a Labor MP received a suspicious parcel which sources say contained an unknown liquid", tweeted the Westminster police adding that "the suspect package was sent to Bedford MP Mohammad Yasin". The substance was later found to be harmless.
Police said they were called at 12:58hrs to reports of a suspicious package at Norman Shaw Buildings, Victoria Embankment, Westminster.
"London Ambulance Service attended". 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.
A parliamentary spokesperson said on Tuesday that two items of mail containing suspicious substances were investigated by the Metropolitan Police and were not found to be hazardous.
"Those that seek to divide us will find that our country is united in mutual respect, proud of our diversity and ready to protect our shared future".
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