Michelle Whitehead, right, and her sister Judy Whitehead, left, both cousin of victim Ashley Whitehead, during the vigil for victims the day after a shooting at Seattle Center during the Bite of Seattle food festival, Monday, July 27, in Seattle. AP-Yonhap

SEATTLE — The 15-year-old arrested after a shootout at a food festival near Seattle’s Space Needle over the weekend was armed with a ghost gun with an extended magazine, police said Tuesday.

Police Chief Shon Barnes told a news conference that the weapon was a 9 mm gun from Polymer80 — a now-defunct company that was once a leading manufacturer of ghost gun parts.

Investigators also recovered two other weapons and 14 shell casings that had been fired by weapons of two different calibers, he said.

Festival shooting killed 3 people and injured 4, including a toddler