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A Cambridge teen was arraigned Wednesday on various charges including armed assault with intent to murder after allegedly knocking a woman unconscious and robbing her in July.

Isaias De La Rosa, 16, of Cambridge, was arraigned Sept. 25, in Cambridge Juvenile Court as a youthful offender on the charges of armed assault with intent to murder, armed robbery, mayhem, assault and battery with a dangerous weapon causing serious bodily injury and assault and battery causing serious bodily injury, according to the Middlesex District Attorney's Office.

The charges stem from a July 13 attack in which a Cambridge woman in her early 30s was struck in the head and knocked unconscious during a robbery on Loughery Walkway in Kendall Square around 10:44 p.m.

The woman, who was walking home from the Kendall Square MBTA station, was reportedly talking on her phone when she saw a young man, later identified as De La Rosa, on his bicycle come up behind her on the path, the DA said. When she moved to allow him to pass, he allegedly got off his bike, approached her from behind and struck her in the back of the head with an unknown sharp object.

The man she was talking to on the phone heard her scream and called Cambridge police who arrived moments later, according to the DA's Office.

Officers found the victim knocked unconscious and her left eye was swollen shut. She also had cuts on her face, over her eye and on her forehead. She was transported to the hospital in serious condition. She had to undergo several surgeries and subsequently lost vision in her left eye, according to the DA's Office.

At the time when the incident was first reported, Jeremy Warnick, communications director for CPD, called the attack alarming due to the severity of her injuries.

An hour after the robbery, police were able to find surveillance footage allegedly showing De La Rosa following the woman, and then De La Rosa fleeing on his bike with the woman's purse. Moments later, at approximately 11:45 p.m., a Cambridge Police officer reportedly saw De La Rosa on Fifth Street, not far from the alleged assault, and recognized him from the surveillance video.

After getting consent from a family member to search the juvenile’s home, police allegedly found a bike in the backyard, as well as similar clothing is seen in the video. The woman’s belongings were in a nearby trash barrel.

De La Rosa was ordered held without bail. The next scheduled hearing is Oct. 23.