Several screenshots have appeared including several involving suspects giving up and being arrested.

It was not clear if the mass Hamas arrests involved specific suspects or was instead a general roundup of people who may not be held for long.

But cases involving juvenile suspects are governed by tighter restrictions, according to department policy.

They said the headquarters would be better able to monitor developments in an investigation that involves suspects in several different regions of the country.

Since the arrest of a second accused gunman earlier this year, officials familiar with the investigation say that it has focused on a more elaborate conspiracy, one involving higher-profile suspects.

Responding to complaints of profiling, the department noted that while 55.2 percent of those stopped were black, 68.5 percent of reported crimes involved suspects described as black.

The first female police officers were inducted in 1931 to assist in inquiries involving female suspects and prisoners.

Nearly all the cases involved black or Hispanic suspects.

A looting was described as "a smash-and-grab type situation" involving multiple suspects, Mr. Kelly said.

The newly elected President of the United States has already issued a regulation banning the use of torture during hearings involving terrorist suspects.