This post has been updated.
Police responded to a reported shooting at the Salt Lake City, Utah federal courthouse on Monday, according to the Salt Lake Tribune.
At least one person was injured in the shooting and was taken out of the building on a stretcher, police told KSL News.
A defendant was reportedly shot by a U.S. Marshall when they tried to stab a witness with a pen, Portia Louder, who was in the courthouse at the time, told the Tribune.
The trial was related to an alleged member of the Tongan Crips gang, Melodie Rydalch of the U.S. Attorneys Office told the Tribune.
The defendant in the case, Siale Angilau, was charged with shooting two deputy U.S. Marshalls in 2007.
Most local police were kept out of the building, which was put on lockdown, according to the Tribune.