Lt. Dave Haywood with Fort Collins police says the Welcome Back Party was sponsored by Ram's Pointe Apartments near West Elizabeth and Taft Hill Road.
Haywood says Poudre Valley Hospital called police after the hospital started receiving calls of people passed out from too much alcohol around 2 p.m.
Ten people were transported from the scene and five people were treated and released at the scene.
Four people were arrested, two for Assault and Disorderly Conduct and two for Obstructing a Police Officer.
Haywood says they do not know if there were minors drinking or if any other citations will be given. He says the apartment building houses mostly students.
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