TEMECULA (CBSLA.com) — A Southern California Edison employee died Thursday in an accident involving underground equipment, according to officials.

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Firefighters responded to a call at 7:47 a.m. near Murrieta and Ridgemoor roads in Menifee, according to CAL FIRE and Riverside County officials.

Firefighters performing a technical rescue found one person dead at the location, Edison spokesperson Lois Pitter Bruce said.

Three additional Edison employees were also injured and transported to an area hospital for treatment.

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The crews were working near an Edison (SCE) substation when the accident occurred, Bruce said.

Officials did not provide details on the cause of death. The identity of the victim has been withheld until the victim’s family has been notified.

A copper theft at a nearby SCE facility Wednesday afternoon that triggered a power outage was “unrelated to today’s tragic accident but near the same location,” Edison’s Lauren Bartlett said.

The incident is currently under investigation by Edison officials.

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No other details were immediately available.