A police investigation has been launched after a death threat aimed at controversial Bradford West MP George Galloway was sent to the Houses of Parliament.
Officers from the Palace of Westminster contacted the Metropolitan Police's Counter Terrorism Command following the receipt of the letter on Monday.
According to a source, the letter included a threat that the Respect Party MP would "die from a deadly virus".
Scotland Yard said the letter was being treated as "malicious communications" but the force did not name the MP it was intended for.
"Officers from the Palace of Westminster contacted the Met's Counter Terrorism Command on Monday, September 15 following the receipt of a letter intended for a member of the House of Commons. This letter is being treated as malicious communications. No arrests have been made. Inquries are ongoing."
Writing on Twitter, Mr Galloway said he was grateful to police and staff in the post room at Parliament who were "the ones endangered".
On Monday the pro-Palestine MP for Bradford West was speaking at a No campaign rally in Glasgow ahead of the referendum on Scottish independence.
Last month Mr Galloway was badly injured after he was attacked in the street in Notting Hill, west London.
He had earlier been interviewed by West Yorkshire Police following a speech in Leeds in which he claimed Bradford was an Israel-free zone.
Controversial Bradford West MP George Galloway has been taken to hospital with a suspected broken jaw after he was attacked in the street.
The Respect MP, who also suffered a suspected broken rib and severe bruising to his face and head, was posing for pictures with people in Golborne Road, Notting Hill, west London, last night, when a man shouted a comment about the Holocaust and allegedly attacked him. Police were quickly on the scene and made an arrest.
Mr Galloway was taken to St Mary's Hospital, Paddington, where he remained overnight.
His spokesman said: "George was posing for pictures with people and this guy just attacked him, leapt on him and started punching him.
"It appears to be connected with his comments about Israel because the guy was shouting about the Holocaust."
Mr Galloway was interviewed earlier this month by West Yorkshire Police following a speech in Leeds in which he claimed Bradford was an Israeli-free area.
A Metropolitan Police spokesman said: "Police were called at approximately 1940 hours to Golborne Road, W10, after a man was assaulted in the street.
"Officers attended. The suspect was found a short time later and stopped. He was arrested on suspicion of ABH (actual bodily harm) and taken to the south London police station where he remains."
Bradford West MP, George Galloway, has called for those accused of sexual crimes to be granted anonymity similar to their victims.
Speaking on BBC's Question Time programme, Galloway referenced the recent charges against Coronation Street actor, Bill Roache, labelling them as "vastly expensive" and "dangerous".
Respect MP George Galloway has said he would like to become prime minister of an independent Scotland if his bid to convince Scots to vote "Naw" in the referendum fails.
The Scots-born MP for Bradford West, who was expelled from Tony Blair's Labour Party in 2003, said he would prefer "a real Labour prime minister of the whole of Britain" but said he would "fancy being prime minister of Scotland" if it votes for independence on September 18
Galloway was in Edinburgh for the latest date in his "Just Saw Naw" speaking tour.
His appearance was met by rival protests by the left-wing Radical Independence group, which opposes his pro-union stance, and the right-wing Scottish Defence League, which opposes his links with religious minorities.
Speaking ahead of his appearance, Mr Galloway said: "I would fancy being prime minister of Scotland but I would rather we had a real Labour prime minister of the whole of Britain.
"I want to avoid the break-up of the country which I think will beggar people on both sides of the border, will lead to permanent Tory rule in Westminster and thus the Bank of England which will control the Scottish economy.
"Unleashed will be a race to the bottom with England cutting taxes, regulation, public spending, and Scotland having to follow it.
"So everyone on both sides of the border will be worse off."
Galloway said he believes in "united countries" including a united Ireland, saying he would support Northern Ireland's exit from the UK, in contrast to his bid to stop Scotland from leaving.
"I don't believe in breaking countries up as I think we have too many countries in the world, not too few,"
"The Irish people were denied their right to unity and independence. The Scottish people never have been, and could have voted for independence at any time that they liked in the whole era of universal suffrage of nearly 100 years.
He said he would contemplate becoming an MP of an independent Scottish Parliament in the "hypothetical" event of Yes vote.
He added: "I am confident that the vote will be No, and I just want to make sure that it's a decisive result because otherwise the kind of hatred and division that this campaign is at risk of sowing will be a permanent feature of Scottish politics and public life."
Respect MP George Galloway has called for a police investigation into the King's Science Academy in Bradford.
The school has been told to pay back over £80,000 of public money which was allegedly misspent following an investigation by the Department for Education.
West Yorkshire Police decided not to pursue the school at the time of the investigation.
The Bradford West MP George Galloway is calling for urgent action to improve air quality in the city after figures revealed it has the fourth-highest number of emergency hospital admissions for people suffering from Asthma.
Campaign group Asthma UK say the city is one of the worst places in the country to be an asthma sufferer because of air pollution.
Mr Galloway is now calling for tough measures on large vehicles, to make sure they're not exceeding emissions limits.
"It's sensible, as the council's Low Emission Strategy recommends, to direct heavy vehicles away from pollution trouble-spots like Manningham Lane. But it doesn't go far enough. We need rigorous spot-checks on HGVs and buses to see if their emissions are below the legal limit. I'm not convinced this is happening and I will be asking questions in parliament about it."
George Galloway hailed his victory in a by election last year as the Bradford Spring. But could it be turning into a winter of discontent for the MP?
Five Bradford city councillors who were members of his Respect Party have resigned from the organisation in a dispute with party officials.
It comes after two of them were suspended in August for criticising Mr Galloway's interest in running for London Mayor.
Bradford Councillor Mohammad Shabbir, who has resigned from the Respect party, says he had too few meetings with MP George Galloway.
The Respect party say the five Bradford councillors who resigned from the party had been trying to control the party:
It is entirely in character that the five councillors who have resigned from Respect in Bradford did so under cover of darkness, putting out their rambling statement in the middle of the night. Two of them 'resigned' having been expelled by the party, a logical impossibility...
...Two of the five councillors, Ishtiaq Ahmed and Mohammed Shabir, repeatedly briefed against the Respect party and George Galloway, including to members of the press. They were suspended from the party some two months ago, and were expelled yesterday...
...This is not about principal, or policy, but self-interest and a naked attempt by the five councillors and one ally to control the party in Bradford. They proposed a constitution which would have given them absolute power in the party in the city. It came to a head when they proposed installing their ally in what they considered to be a safe seat at the forthcoming May election. These machinations were rejected by the national party. Since then they have continued to act against Respect.
The five, some of whom have chequered political histories, were elected on the coattails of George Galloway's historic win in Bradford West. Does anyone seriously doubt that? Their visibility and impact in the council chamber has been virtually non-existent. If they had a shred of principle they would now resign their council seats and stand again in their new colours. Or will they instead continue to draw thousands of pounds of public money until they are removed by the voters?
Five Bradford Respect councillors who have resigned over comments made by MP George Galloway about the London Mayorship in 2016 have released a statement about their resignation:
...discussions have failed to find common ground as senior Respect officials have shown a disregard to address our legitimate grievances and we have been unable to resolve our issues of difference. After much deliberation this has left our group no choice but to fully resign from the Respect party with immediate effect...This decision has not been made lightly and we are saddened that certain ‘gatekeepers’ involved in Bradford Respect appear to have no interest in transparency, accountability and equity...
...I want to assert that as a group we entered into local politics with a view to stand up for Bradfordians and therefore we believe we have acted in the best interest of Bradford. Needless to say we will remain committed to the electorate and will continue to advocate for the citizens of Bradford and work hard for the interests of our constituents and we will continue to represent them in Council on the issues that affect them in the district.