user: Article: Nick Hardwick, chief prisons inspector, said Yarl's Wood, in Bedfordshire, was failing vulnerable women.
He said the concerns showed women, including pregnant ones, should be detained only as a last resort.
A Home Office spokesman said it was "committed to treating all detainees with dignity and respect".
Yarl's Wood holds more than 350 detainees, most of them single women, who are waiting for their immigration status to be resolved.
Mr Hardwick's report suggests that conditions have worsened since inspectors last visited two years ago. More than half of the detainees who were surveyed said they felt unsafe.
Mr Hardwick said that while a total of 443 women held at the centre were removed from the UK in the six months before the inspection, just over twice that number were released back to the community.
Of the 99 pregnant women who were held at Yarl's Wood last year, only nine were removed.
Fifteen detainees had been held for between six months and a year. Four were detained for more than a year, the longest being 17 months.
"When you're there, there's no light in your life" - One former detainee's story
Mr Hardwick called for a "strict time limit" on how long anyone can be detained.
"Yarl's Wood is rightly a place of national concern. While there have been instances of unacceptable individual behaviour, most staff work hard to mitigate the worst effects of detention and women told us they appreciated this.
"These are issues that need to be addressed at a policy and strategic management level. We have raised many of the concerns in this report before.
"Decisive action is needed to ensure that women are only detained as a last resort. Other well-respected bodies have recently called for time limits on administrative detention, and the concerns we have identified provide strong support for these calls."
The Home Office has commissioned the former prisons ombudsman, Stephen Shaw, to independently review welfare in detention and he will report in the autumn.
A Home Office spokesman said: "A number of the findings in this report are extremely disappointing. Working with our partners, we want to make sure standards in the centre improve, especially regarding the provision and delivery of healthcare.
"We are committed to treating all detainees with dignity and respect. We aim to protect the health and wellbeing of those we are detaining at all times so we are pleased that this report finds that 80% of detainees surveyed said staff treated them with respect.
But Emma Ginn, of charity Medical Justice, said: "Immigration removal centres are dangerous places for many vulnerable detainees.  They should be closed on health grounds while a comprehensive and independent investigation is carried out."
And Jerome Phelps, of campaign group Detention Action, said: "It is high time for the government to step away from the routine detention of migrants, and instead to work with them to resolve their immigration cases in the community wherever possible."
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Summarize: Conditions have deteriorated at an immigration removal centre to such an extent that it is a "place of national concern", the prisons watchdog says.


Article: Graham Carroll, 26, will take part in the world's richest sim race - the Visa Vegas eRace in the North American city.
The 28-lap race starts at 00:00 on Sunday (British time) and has $1m (£812,000) worth of prize money over several categories.
His rivals include 20 pro drivers from the FIA Formula E Championship.
Mr Carroll abandoned real-life racing when, after his second Formula Ford title win in 2008, he ran out of funds.
The event is timed to coincide with the last day of the CES tech expo in the city.
Mr Carroll, told BBC Radio Scotland's Kaye Adams Programme it was nerve-racking when so much prize money was at stake.
He said: "These days the simulator is pretty much as real as you are going to get. The simulators I've been using over the last few years can get you ready for driving a real car because they are so like real life.
"When I first started off at this competition to get my ticket to Vegas there was a four round qualifier and I won the first round of the series and the week leading up to that I was on it six hours a day, I was treating it like a job because if you qualify and go to Vegas you win a minimum of $20,000 (£16,000).
"So to get that ticket out there meant a lot to me and its going to be good to be one of the 10 that make it there."
He added: "It's going to be pretty nervy, if you think about it you can make $25,000 if you make it to pole position too, that's going to be nerve-racking."
Car-makers choose virtual assistants
Ford sticks to self-driving cars by 2021 pledge
Strap turns your finger into a phone
Jeans tickle users to keep them on track
Read all our CES coverage at bbc.co.uk/ces2017
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Summarize: An Edinburgh man is competing in a racing car simulator event in Las Vegas in a bid to win $200,000 (£162,000) after qualifying from his bedroom.


Article: 21 January 2016 Last updated at 15:15 GMT
He also thinks we must all get used to the slowing pace of economic growth in China.
Mr Schaueble was talking to the BBC's Tanya Beckett at the World Economic Forum in Davos.
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Summarize: Europe is in a relatively "good situation" but still has "unsolved problems" according to Germany's Finance Minister, Wolfgang Schaueble.


Article: It was claimed in the (Irish parliament) Dáil  last week that a Northern Ireland politician stood to benefit.
The issue was raised again in Leaders' Question time in the Dáil on Tuesday.
The leader of the main opposition party, Fianna Fáil, said the allegations around the sale were of "enormous concern".
Micheál Martin added that a Commission of Investigation was "urgently required".
In the Republic of Ireland, a Commission of Investigation can be set up by government to investigate matters of significant public concern.
They seek the voluntary co-operation of those they want to question, but if necessary, commissions have the power to compel witnesses to testify.
Speaking in the Dáil , Sinn Féin leader Gerry Adams also called for a Commission of Investigation and said his party had "little confidence the government is protecting the public interest".
But the Enterprise Minister Richard Bruton, answering for the government, said he did not accept there was a need for such a commission.
He said that Nama had discharged its business in "a very thorough way" and that the Comptroller and Auditor General would have been across the decision.
Mr Bruton said that the issues Mr Martin raised about the decision taken by the NAMA board on whether loans should be sold individually or a bundle were "a legitimate matter" for questioning at the Dáil Public Accounts Committee (PAC).
Nama representatives are due to appear before the PAC on Thursday.
The National Asset Management Agency (Nama) is the Republic of Ireland's "bad bank".
It was set up to deal with toxic property loans on the books of bailed-out banks, following the 2008 property crash.
Last year, Nama sold its entire 850-property loan portfolio in Northern Ireland to the New York investment firm Cerberus for more than £1bn.
The deal was the largest ever property transaction in Northern Ireland.
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Summarize:

assistant: The Irish government has rejected calls to set up a Commission of Investigation into the sale of Nama's portfolio of loans in Northern Ireland.