About half of the 103 people arrested had previous arrests or convictions for violent crimes, officials said.
The prosecutor also referred to reports of Pistorius being "verbally violent" with officials, which he said Scholtz had ignored, and said that the sportsman was depressed only because he "felt sorry for himself".
The police officers involved in the network had clashed with authorities in 2012 when they grew beards, in accordance with their strict interpretation of Islamic custom, and had been shifted to reserve forces before becoming involved in violent extremism, officials said.
"He was very aggressive and violent," an official of the prison in Palermo where Amri was detained told the Guardian.
But if Hasan, 39, sought spiritual guidance, advice or aid from al-Aulaqi or others known to espouse violent extremist ideas, officials will have to determine whether the army and law enforcement officials missed warning signs.
For moderate Muslims, it is "faith without reason" or violent fundamentalism.The same officials also insist that the German lecture was not a deliberate provocation.
In theory, the youngsters accepted by Pleasantville do not have criminal or violent pasts, and officials said the attack on the counselor was a gross aberration.
Large street protests that turn violent, and that officials and security forces have been powerless to stop, have been on the rise in recent years, analysts say.
On Friday, Mr. Kerry is expected to explain that radicalization is often fueled by conditions at the local level and that there is no one-size-fits-all approach to countering violent extremism, State Department officials said.
