ANTIOCH — Authorities are searching for a 15-year-old girl who was last seen more than 10 days ago, police said Wednesday.

Naomi Lomax was last seen around 7 a.m. on Sept. 17 near the 4400 block of Wolf Way, according to Antioch police.

Lomax’s mother, Elizabeth Chavez, said that her daughter was at the Antioch Skate Park when they were given a ride to a party on the corner of Dogwood Way and Linden Way where there were half-dozen teenage girls and nearly two dozen adult males.

Chavez said that her teachers and friends at Deer Valley High School are all concerned about Lomax’s whereabouts.

“We’re very close and she’s been doing well in school … her teacher is very sick about it,” Chavez said. “She won’t go to Walmart without makeup on and she left her makeup on her dresser and didn’t take her favorite backpack. That’s what made the panic take in my heart. She always comes home. She’s never disappeared.”

According to Chavez’s discussions with people who said they were at the party, there may have been marijuana edibles there and that Lomax was seen leaving the party at 1:30 a.m. A man she was seen leaving the party with said she was dropped off at a friend’s house at 7 a.m., but the friend and others deny she ever arrived, Chavez said.

She is described as mixed-race with brown eyes and dark curly hair that is currently dyed red. Lomax is 5-foot-3 and weighs about 120 pounds. She was last seen wearing black pants, a red flannel shirt, black shoes, and a black hat.

Missing person posters showing Lomax’s picture have been posted as far as Oakland. Chavez is asking for the public’s help in finding her daughter.

“Being a regular person and walking by those posters every day, you’re not really affected by it,” Chavez said. “But when it’s close to home, you start to care.”

Anyone with information on the missing girl is encouraged to call Detective Matt Allendorph at 925-779-6933.