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By Thomas Mackintosh
BBC News, London
Overcrowding at a migrant centre in Kent has eased in recent days, but the "crisis is not over", the head of the Home Affairs Committee of MPs has said.
Dame Diana Johnson says the Manston immigration processing site is back to a safe occupancy level of 1,600 people.
It had reached highs of 4,000 last week - more than double its capacity.
But Labour's Dame Diana said questions remain over "the legality of the home secretary's decision to detain people at the site for longer than 24 hours".
The government said Suella Braverman has taken "urgent decisions" to alleviate issues at Manston by sourcing alternative accommodation.
Migrants are meant to be held there for short periods of time while undergoing security and identity checks.
They are then supposed to be moved into the Home Office's asylum accommodation system. But some people have been held for longer periods of time because of an apparent lack of alternative accommodation - and concerns have been raised over conditions.
On Tuesday the Home Affairs Committee - made up of MPs from several parties - visited Manston and praised staff for making "valiant efforts" at trying to improve conditions for detainees.
But, Dame Diana warned "the crisis is not over".
"We encountered families who had been sleeping on mats on the floor for weeks," she added.
"The Home Office has been running to keep up with this escalating crisis, rather than warding it off at the outset through planning and preparation."
Last Wednesday, one migrant told the BBC that conditions at Manston were like living in a zoo.
He described being forced to sleep on the floor, and being prevented from going to the toilet, taking a shower or going outside for exercise.
Dame Diana called on the home secretary to deal with a backlog in the asylum system in order to keep numbers down.
A Home Office spokesperson earlier insisted Manston remains resourced and equipped to process people securely while alternative accommodation is found.
They added: "We take the safety and welfare of those in our care extremely seriously and all basic needs are provided for including hot food, fresh clothing, sanitary packs, and medical care where needed."
Meanwhile, lawyers for two councils have urged the High Court to block the Home Office's contractors from using large hotels to house asylum seekers.
Ipswich Borough Council and East Riding of Yorkshire Council say the hotels in their patches are being unlawfully converted into asylum seeker hostels and they want them stopped by court injunctions.