SALT LAKE CITY (AP) — The FBI says a defendant has died after being shot by a U.S. marshal during an attack on a witness during a trial in federal court in Salt Lake City.

When Utah's new federal courthouse opened last week, it came with security improvements that are becoming standard around the country: separate entrances and elevators for judges, defendants and the public; bullet-resistant glass and paneling; and vehicle barricades to keep car bombs at bay.

But nothing can prevent every violent courtroom outburst. Authorities said that when a 5-foot-11, 230-pound, pen-wielding defendant rushed a witness during his racketeering trial Monday, a more old-fashioned form of security left him dead: an armed U.S. marshal.

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Siale Angilau, 25, was shot several times in front of stunned jurors, lawyers and courtroom watchers. He was one of 17 people named in a 2010 indictment accusing "Tongan Crip" gang members of assault, conspiracy, robbery and weapons offenses.

The unidentified witness, who was unhurt, had been testifying about gang initiation when Angilau charged him. Prosecutors say Angilau, also known by his street name "C-Down," was a member of the Tongan Crips, a group of men of mostly Tongan descent that are aligned with a larger Crip culture in the Western United States.

The last defendant in the case to stand trial, Angilau was accused of robbing convenience stores and assaulting clerks in Salt Lake City on five occasions from 2002 to 2007. A clerk was shot in the final robbery. He was also accused of assaulting a federal officer with a weapon on Aug. 11, 2007.

Angilau's trial was among the first at the new $185 million federal courthouse in downtown Salt Lake City, next door to the century-old federal facility it replaced.

U.S. District Judge Tena Campbell declared a mistrial after the shooting, noting in her order that jurors were visibly shaken and upset.

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