The Santa Clara County Office of the Sheriff is continuing the search for a missing Cupertino teen and is asking the public for assistance.

On April 20, deputies responded to the 900 block of November Drive in Cupertino for a missing juvenile, later identified as Connor Sullivan.

Connor was last seen by his family Monday at approximately 7 a.m. before leaving for his first period class at Monta Vista High School. He missed his remaining classes. Connor also failed to attend his track practice during the afternoon, according to the Office of the Sheriff.

Connor’s last contact was by school staff at approximately 10 a.m. Connor was not seen the rest of the school day.

Volunteers from the city of Cupertino’s emergency response teams and citizen corps, residents, and students have been actively searching for Connor. A command post has been set up at Monta Vista High School’s parking lot with a search party to begin at 3:30 p.m. Wednesday, according to the city of Cupertino.

City response volunteers were activated at 8 p.m. Tuesday with 15 volunteers breaking up into six teams. A team walked the railroad track between Bubb Road and the Interstate-280 and Highway 85. All of Monta Vista High School was searched as was Vallco Shopping Mall. Numerous shops and businesses like Target on Stevens Creek Boulevard and the Home Depot on De Anza Boulevard in San Jose were searched, according to Fari Aberg, a longtime CERT volunteer in Cupertino.

On Wednesday, another search began at 8 a.m. with a command post set up at the post office on Stevens Creek Boulevard.

Volunteers are going to continue to search throughout the day along with sheriff deputy assistance, according to Sgt. James Jensen, sheriff’s office spokesperson.

Connor is 17 years old, approximately 5 feet 5 inches tall, and weighs approximately 150 pounds. Connor was last seen by school staff wearing a black shirt, faded black sweatshirt, black shorts, and blue-white athletic shoes. He is half-Caucasian and half-Asian.

Connor has a dark color backpack and a smaller athletic bag containing school books and track equipment.

Deputies previously checked Monta Vista High School, The Oaks Shopping Center, local parks and contacted local hospitals. It is believed Connor has a cell phone in his possession.

Connor enjoys running cross country in the area of the Fremont Older Open Space Preserve, according to a media release by the Office of the Sheriff.

If Connor is located, residents are asked to contact local law enforcement immediately at 408.299.3233. The city of Cupertino contracts with the Santa Clara County Office of the Sheriff.