A poster for a missing autistic 14-year-old named Avonte Oquendo hangs in subway station on October 21, 2013 in New York City. Hundreds of Police, volunteers, friends and family are searching for Avonte who walked out of the Center Boulevard School in Long Island City, Queens on October 4, 2013 and has not been seen since. Family members say that the teen has a fondness for trains and have focused their search along rail yards and in subway stations. (Photo by Spencer Platt/Getty Images)

NEW YORK (AP) — The New York City medical examiner’s office says that human remains found along the East River are those of an autistic teen missing for three months.

The office said Tuesday that DNA tests confirm the remains found Thursday are those of 14-year-old Avonte Oquendo. He was last seen walking out of his school on Oct. 4. His disappearance prompted a search that included hundreds of police and volunteers.

The medical examiner says the cause and manner of death are pending further study.

A teenage girl shooting photos in a Queens park noticed a left arm, leading to the discovery of legs and lower torso. A part of a skull was also later recovered.

Authorities made the identification through DNA given by his family.

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