The Greeley Fire Department is investigating the cause of a second alarm fire on 9th Avenue Sunday morning. At about 5:30 a.m., the fire department responded to a fire in a large commercial building in the 100 block of 9th Avenue, according to a Facebook post. Upon arriving at the scene, crews requested additional GFD units as well as personnel from Platte Valley Fire District, Windsor/Severance Fire District, Evans Fire District, and Eaton Fire District, the Facebook post said. Read more at: https://www.9news.com/article/news/local/greeley-fire-investigation/73-47e2835b-4253-474c-a5fb-9514ebf9d403 More local videos here: https://youtube.com/@9news Subscribe to NEXT: https://youtube.com/@Nexton9NEWS Stay connected: 9NEWS Website: https://www.9news.com/ Facebook: https://www.facebook.com/ilike9news X: https://twitter.com/9NEWS Instagram: https://www.instagram.com/9newsdenver/ Download the 9NEWS App: https://www.9news.com/appredirect/ Sign up for the 9NEWSLETTER: https://www.9news.com/email 9NEWS (KUSA) is located in Denver, Colorado.