Scotland Yard has defended its handling of the inquiries into hacking and corrupt payments by journalists amid heavy criticism, insisting the operations were not "in any way disproportionate".
Trevor Kavanagh, associate editor of The Sun, claimed the police investigation into alleged press malpractice was regarded by many as a "witch-hunt" after five of his colleagues were arrested at the weekend.
But police said in a statement that "given the seriousness of the allegations currently under investigation and the significant number of victims, the MPS (Metropolitan Police Service) does not believe that the level of resources devoted to the three inquiries is in any way disproportionate to the enormous task in hand."
Kavanagh suggested up to 20 officers at a time had raided the homes of deputy editor Geoff Webster, picture editor John Edwards, chief reporter John Kay, chief foreign correspondent Nick Parker, and John Sturgis, who is a news editor.
Police denied this however, saying no more than 10 officers attended each of the home addresses on Saturday.
Some 169 officers and staff are currently working on the three linked investigations into phone hacking, improper payments to police and public officials, and data intrusion by journalists - named operations Weeting, Elveden and Tuleta.
Police described them as "extremely difficult and complex with literally millions of pieces of documentation needing to be scrutinised and examined".
Their statement said: "Saturday's Operation Elveden arrests were as a result of information provided to officers by News Corporation's Management Standards Committee (MSC).
"We would like to make it clear that no more than 10 MPS officers attended each of the home addresses of the persons arrested as part of Operation Elveden on Saturday February 11.
"It should be noted that several officers are needed for the thorough and efficient search of an address, including, where appropriate, specialist search teams."
The statement was issued after today's Sun published Kavanagh's forthright attack on the police who arrested the five Sun journalists over allegations of improper payments to police and public officials.
In a strongly worded article, he argued that those arrested had been released on "draconian" bail terms like those imposed on suspected terrorists.
He wrote: "The Sun is not a 'swamp' that needs draining. Nor are those other great News International titles, The Times and The Sunday Times.
"Yet in what would at any other time cause uproar in Parliament and among civil liberty and human rights campaigners, its journalists are being treated like members of an organised crime gang.
"They are subjects of the biggest police operation in British criminal history - bigger even than the Pan Am Lockerbie murder probe."
He added: "Instead of being called in for questioning, 30 journalists have been needlessly dragged from their beds in dawn raids, arrested and held in police cells while their homes are ransacked.
"Wives and children have been humiliated as up to 20 officers at a time rip up floorboards and sift through intimate possessions, love letters and entirely private documents."
Following the arrest of four former and current Sun journalists last month as a result of information provided to police by the MSC, a News International source told the BBC of an effort aimed at "draining the swamp" to restore journalistic integrity to the publisher's titles.
Kavanagh, The Sun's former political editor, said it was "absolutely right" for News International to co-operate with the police investigations into phone hacking and illegal payments to public officials.
But he added: "Some of the greatest legends in Fleet Street have been held, at least on the basis of evidence so far revealed, for simply doing their jobs as journalists on behalf of the company.
"Meanwhile, a huge operation driven by politicians threatens the very foundations of a free press."
He later claimed it was clear there were people who wanted to see The Sun closed down.
"There are people who will stop at nothing to destroy News International," he told BBC Radio 4's The World At One.
"The News of the World has already closed and they will not be satisfied until The Sun is closed too and I have to tell you that is not going to happen."
He also said there were concerns at the way evidence passed to the police by the MSC was being used.
"There is unease about the way some of the best journalists in Fleet Street have ended up being arrested on evidence which the MSC has handed to the police," he said.
A serving officer in Surrey Police, a Ministry of Defence employee and a serving officer in the armed forces were also detained by officers from Operation Elveden on Saturday.
All eight people were released on bail.
Of the 169 officers and staff deployed to the three investigations under way, 91 are working on Operation Weeting, 61 on Operation Elveden and 16 on Operation Tuleta, with a Detective Chief Superintendent overseeing all three.
Scotland Yard's statement said: "These resources are constantly reviewed and where they relate to corrupt payments to police officers the IPCC (Independent Police Complaints Commission) have oversight."
Below is the Met's statement in full:
"The linked Operations Weeting, Elveden and Tuleta are extremely difficult and complex with literally millions of pieces of documentation needing to be scrutinised and examined.
"Given the seriousness of the allegations currently under investigation and the significant number of victims, the MPS does not believe that the level of resources devoted to the three inquiries is in any way disproportionate to the enormous task in hand.
"There are 169 officers and staff currently deployed to the three linked investigations. Of these, 91 officers and staff are deployed to Operation Weeting; 61 to Operation Elveden; and 16 to Operation Tuleta with a Detective Chief Superintendent overseeing the three investigations. These resources are constantly reviewed and where they relate to corrupt payments to police officers the IPCC have oversight.
"The majority have come from Specialist Crime; Territorial Policing and the Directorate of Professional Standards. At no stage has any major investigation been compromised as a result of these deployments.
"Saturday's Operation Elveden arrests were as a result of information provided to officers by News Corporation's Management Standards Committee.
"We would like to make it clear that no more than ten MPS officers attended each of the home addresses of the persons arrested as part of Operation Elveden on Saturday, 11 February. It should be noted that several officers are needed for the thorough and efficient search of an address, including, where appropriate, specialist search teams."