An FBI agent says three siblings wanted in a cross-country crime spree were prepared for a gun battle and officers said they heard gunshots as they chased the trio in Colorado.

FBI Special Agent Daniel Leyman testified that investigators found at least nine firearms near or in the car, including two AK-47 type rifles, two machine pistols, two shotguns and three handguns. All but one of the weapons was loaded.

The officers testified Tuesday during a hearing in Walsenburg, Colo., to determine whether the three will stand trial. Lee Grace Dougherty and her brothers, Dylan Stanley-Dougherty and Ryan Dougherty, were shackled as they listened.

Each sibling is charged with five counts of attempted second-degree murder and five counts of first-degree assault.