A member of Ms Huq's staff was taken to hospital, but was later discharged. It was sent to the office of Mohammad Yasin, who was elected as the Labour MP for Bedford at the 2017 snap general election.
A suspicious package sent to a Muslim MP at the Houses of Parliament is feared to be linked to "Punish a Muslim Day".
Police are investigating after "Punish a Muslim day" letters have reportedly been delivered to addresses in the Midlands.
Labour MP Yasmin Qureshi revealed that letters had been received in Bradford, Leicester, London, Cardiff and Sheffield.
"Tell MAMA documented past year how the so-called "Muslim Slayer" targeted mosques in parts of London and the United States in 2017 with similar threats, and in some cases, with non-toxic white powder".
But, she said: 'It is frightful though, it's really very frightening.
"Today we stand together with those facing this vile Islamophobia, to show them support, care and solidarity".
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A message of hate against Muslims: When will the United Kingdom government stop it?
A parliamentary spokesman confirmed four packages had been sent to the building in recent days and said police were investigating the latest package.
Emergency services were called to the Norman Shaw Building, which hosts some parliamentary offices, "at 12.58 p.m.to reports of a suspicious package at Norman Shaw Buildings, Victoria Embankment, Westminster", a police statement said.
Scotland Yard announced that an anti-terrorism investigation was under way to identify the ones behind these letters.
"People should then get in touch with us at Tell MAMA or call 101 to be put through to the local police force".
Muslim MPs have been sent threatening letters which urge people to carry out acid attacks against Muslims, bomb mosques and pull off hijabs.
"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.
A Parliamentary spokesman said: 'The Met Police are now investigating suspicious items of mail in Norman Shaw North.