In 2008, the FBI opened 132 trafficking investigations, made 139 arrests and obtained 94 convictions.
So far there have been no arrests and police have no motive for the crime.
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Such risk assessment is currently based on factors like age, prior arrests and marital status.
"And therefore you saw significantly more arrests and significantly more disorder, " Mr Holt said.
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Miss Stone is aware of the arrests and later said she was "absolutely fine".
Arrests and search warrants in the massive sweep are still unfolding throughout the country today.
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"We are organising joint patrols and operations such as house arrests and searches, " he said.
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Despite the arrests and seizures, there have been no federal indictments for tax fraud.
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There are serious concerns about people disappearing, summary executions, arbitrary arrests and detentions without trials.
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In both cases, widespread arrests and other forms of official intimidation kept dissenters in check.
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Federal officers made 40 arrests and local California police another 17 on state charges.
Meanwhile, the Met Police have made 1, 009 arrests and 464 people have been charged.
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Extra patrols, arrests and car-confiscations can succeed in displacing the races, but not ending them.
Police issued two fixed penalty notices, made two arrests and reported one person for an offence.
The disorder has resulted in more than 100 arrests and left 66 officers injured.
There were no reports of any injuries or arrests and the area was reported calm by midnight.
Mr Cameron said there was a "difficult balance" between publicising arrests and respecting the privacy of suspects.
British Foreign Secretary William Hague said he's "very concerned" about reports of arrests and torture of Othman.
In some previous incidents, the Iraqi government has announced arrests and aired confessions that did not hold up.
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But Colombian President Alvaro Uribe's campaign of arrests and extraditions made ghosts of the Medellin and Cali cartels.
The Met Police has made 820 arrests and charged 279 people in connection with violence in the capital.
Arrests and charges were brought between 2005 and 2008, involving four of the victims and four of the men.
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The cyber-collective Anonymous has been rather quiet recently, following the sobering arrests and court appearances of some key supporters.
The journalists and media proprietors say they have faced a series of arbitrary arrests and beatings since the coup.
He said that they cross checked the accounts through records of arrests and forensic examination of photographs of bodies.
Arrests and investigations laid bare much of what many had suspected for years.
But there were nearly 900, 000 arrests and summons last year under the far more exacting standard of probable cause.
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Legislation, sophisticated snooping, arrests and even jail will have their effect on high-profile activists like Nabeel Rajab and others.
In 2012 there were 300 UKBA enforcement operations and arrests and 230 prosecutions.
After hundreds of arrests and thousands of extra police on the streets, it seemed like this was all finally over.
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