A woman in California was held at gunpoint for "multiple days" until she was rescued after sending a desperate plea for help to a friend, according to officials.

The Nevada County Sheriff's Office said in a news release that 19-year-old Joshua Gaspar of Corona was arrested Saturday while attempting to take the 29-year-old woman to Sacramento.

Authorities were alerted around 11:20 a.m. Saturday by a friend who said the 29-year-old told her she was being held against her will in the North San Juan area and had been sexually assaulted.

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"The suspect was in the process of taking her to Sacramento when the victim was able to send a message to her friend indicating she needed help," the sheriff's office said.

Authorities found Gaspar and the woman at a Chevron Gas Station in Grass Valley, where the 19-year-old was detained.

Joshua Gaspar was arrested Saturday after he allegedly held a woman at gunpoint for several days. (Nevada County Sheriffs Office)

"It was also determined there was most likely more than one suspect involved," said police, who confirmed the victim was held for multiple days at a property in North San Juan and was sexually assaulted several times.

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Gaspar was booked at the Wayne Brown Correctional Facility in Nevada City on charges of kidnapping with intent to commit sexual assault, rape and false imprisonment. A judge set bail at $1 million, according to police.

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The sheriff's office said the investigation into the incident is continuing "into the possibility of additional suspects."

Anyone with information is asked to call the Nevada County Sheriff’s Office Major Crimes Unit at (530) 265-1263.