FREMONT, Calif. (AP/CBS13) – Authorities say a 16-year-old girl shot to death by police in Northern California was pregnant.

Elena Mondragon was killed on Tuesday in Hayward.

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Police say authorities tried to stop a stolen car linked to a series of robberies in the San Francisco Bay Area and instead it rammed a patrol car, injuring two Fremont police detectives.

They opened fire and fatally wounded Mondragon, who was a passenger.

Hayward police tell the Los Angeles Times that Mondragon was in her first trimester of pregnancy.  It is not known whether or not she was involved in the alleged robberies.

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Two other passengers were arrested. A fourth person fled but was arrested for robbery Wednesday night in San Francisco.

The shooting is under investigation by Hayward police and the Alameda County district attorney’s office.

 

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(Copyright 2017 The Associated Press.)