Package containing liquid is found in Labour MP Mohammad Yasin's office

Package containing liquid is found in Labour MP Mohammad Yasin's office

Along with Ealing Central and Acton MP, Rupa Huq, Rushanara Ali, Bethnal Green and Bow, and Mohammad Yasin for Bedford, he received a "Punish a Muslim" letter that advocates violent acts against Muslims.

Three staff members were taken to hospital, however the substance was later found to be harmless.

Yasin won his Bedford seat from the Conservatives by 789 votes at the last general election.

All four letters sent to MPs were found among the offices in the Norman Shaw North building in Westminster, rather than in Parliament itself.

Tell Mama UK, which monitors anti-Muslim hate crimes, said it had received reports of people in Bradford, Leicester, London, Cardiff and Sheffield receiving the letters.

MPs have condemned letters encouraging recipients to take part in "Punish a Muslim Day" as "abhorrent".

"It is frightful though, it's really very frightening", she told the Guardian.

And Ian Austin, Labour MP for Dudley, said he would use the day to visit as many mosques and Muslim community centres in his constituency as possible "to show them I am on their side" and called on other members to join him. "One person attended hospital as a precaution", the spokesperson said.

Ominous letters are being sent anonymously around the United Kingdom urging people to participate in a macabre game called "Punish a Muslim", which awards points for doing things like burning down a mosque or throwing acid on a Muslim person.

The spokesman later said the suspicious substances was found not to be hazardous. "The police are investigating the content of the letters to identify any potential link".

A Metropolitan police spokesman said: 'Police were called at 9.49am on Tuesday, March 13 to reports of a suspicious package at Norman Shaw Buildings, Victoria Embankment, Westminster.

Police are investigating after suspect packages containing anti-Muslim letters and a sticky liquid were sent to party colleagues this week.

"Sadly, it is reflective of hate against Muslims which continues to manifest itself alongside the rise of the far-right", said the council, which represents some 2.7 million British Muslims.

Parliament has reportedly emailed all staff, warning them to "be on the alert for suspicious items of mail".