1.   Also, at least four people have been arrested and are being held as material witnesses.

2.   Although not as expansive, the power of prosecutors over people defined as material witnesses is also broad.

3.   An unspecified number of people are also being held as material witnesses in the terrorism investigation.

4.   An unidentified person was taken into custody in New York on a material witness warrant, a federal government official said.

5.   And the imprisoned suspects and material witnesses cannot get in touch with lawyers or their families.

6.   As a material witness, the person is someone believed to have knowledge of a criminal act who can be held to prevent flight, an official said.

7.   At least four are held as material witnesses, but the remainder are being held in connection with their immigration status.

8.   At some point in late September, while still in custody, Kheir was charged as a material witness.

9.   At least four material witnesses have also been arrested.

10.   Awadallah had been held as a material witness in Manhattan since his arrest about a month ago in San Diego, where he had been attending college.