3 inmates killed, 9 injured in "altercation" at maximum-security prison in Nevada

Three inmates have died and nine others were transported for medical treatment as a result of an "altercation" on Tuesday at a maximum-security prison in a rural mining city in eastern Nevada, the state's Department of Corrections said.

No officers were injured and the department gave no additional details about how the deaths and injuries occurred in Ely, Nevada. The department did not release the names of any of the inmates that died or the conditions of those injured.

CBS affiliate KLAS-TV has learned the altercation appeared to stem from a feud between two rival gangs and there are concerns about possible retaliation.