The home secretary has apologised for the treatment of the Windrush generation, saying it was "wrong" and "appalling" that some face deportation.
Many immigrants who arrived from the Commonwealth decades ago as children have been told they are here illegally.
Amber Rudd said they would be helped to attain required documents for free and added she was concerned her department "sometimes loses sight" of individuals.
Thousands of people arrived in the UK as children in the first wave of Commonwealth immigration 70 years ago.
They are known as the Windrush generation - a reference to the ship, the Empire Windrush, that brought workers from the West Indies to Britain in 1948.
Under the 1971 Immigration Act, all Commonwealth citizens already living in the UK were given indefinite leave to remain - but the right to free movement between Commonwealth nations was ended from that date onwards.
However, the Home Office did not keep a record of those granted leave to remain or issue any paperwork confirming it, meaning it is difficult for the individuals to now prove they are in the UK legally.
Recent changes to immigration law in the UK, which requires people to have documentation to work, rent a property or access benefits, including healthcare, has highlighted the issue and left people fearful about their status.
Home Secretary Ms Rudd confirmed new measures to the House of Commons to help the Windrush generation.
- A new taskforce dedicated to helping those affected
-Plans for the team with departments across government to gather evidence on behalf of immigrants
- A pledge that all cases will be resolved in two weeks
- All fees for new documentation waived so people are not "out of pocket"
- A new website will be set up with information and a direct contact point
Ms Rudd said: "I do not want any of the Commonwealth citizens who are here legally to be impacted in the way they have and frankly, some of the ways they have been treated is wrong, has been appalling, and I am sorry."
Ms Rudd also said she was "concerned that the Home Office has become too concerned with policy and strategy, and sometimes lose sight of the individual", but it was why she decided to act.
'Warm words are not enough'
However, when asked how many of the Windrush generation have been deported as a result of this issue, Ms Rudd said she would have to speak to High Commissioners of different Commonwealth countries to find out if any cases existed.
She told the Commons she was "not aware of any person being removed in these circumstances" and asked anyone who did know of cases to report them to the Home Office.
Shadow home secretary Diane Abbott said the government should consider compensation for anyone who had been wrongly deported.
She said: "We now hear warm words about Commonwealth migrants who have given their lives to this country, but warm words are not enough."
'No question of right to remain'
Earlier, immigration minister Caroline Nokes said some "terrible mistakes" had been made in cases involving the Windrush generation, but she did not answer questions over deportation.
Asked by ITV News if any people had been deported as a result of these "mistakes", Ms Nokes said: "There have been some horrendous situations, which as a minister have appalled me."
Told by the reporter "that's a yes", and asked how many, she said: "No, I don't know the numbers, but what I'm determined to do going forward is we'll have no more of this."
Government quietly deleted clause that protected long-term residents from deportation
All longstanding Commonwealth residents were protected from enforced removal by a specific exemption in the 1999 Immigration and Asylum Act – a clause removed in the updated 2014 legislation.
Frances Webber, a former barrister and vice-chair of the Institute of Race Relations, discovered the deletion of the clause. “I find it very frightening that rights can be removed in this way, surreptitiously, with no debate,” she said.
“It is particularly cruel that the people secretly stripped of these rights will by definition have lived here for getting on for half a century. The inhumanity of it, and the disregard for democracy, are breathtaking. The deletion of the exemption was clearly deliberate … https://www.theguardian.com/uk-news/201 ... ed-in-2014