SANTA CRUZ >> Hundreds of volunteer searchers joined a K-9 Unit, helicopter crew and more than 100 law enforcement officers Monday in a search for an 8-year-old Santa Cruz who disappeared from the Tannery Arts Center in Santa Cruz.

About 5 p.m., the FBI also searched door to door at the Tannery at 1030 River St., law enforcement officers at the scene said.

At an afternoon news conference at the Santa Cruz police station, police spokeswoman Joyce Blaschke declined to say whether any clothing or other evidence of Madyson “Maddy” Middleton was found in the search. She said a K-9 tried to track Middleton’s scent from the Tannery down the San Lorenzo River to the beach.

“It wasn’t solely the beach area,” said Blaschke. “We’re looking around the Tannery area, around the woodland area and around the beach area. At this point, there are well over 100 law enforcement officers, federal agents and search and rescue team members out there looking for Maddy.”

Blaschke said it remains a missing person case, but kidnapping or other foul play has not been ruled out.

“Authorities have been investigating registered sex offenders, neighbors and others,” she said.

“We’re looking at anyone who could be a danger to this young child,” Blaschke said. “We are not calling it a kidnapping. We are searching for a missing child.”

Several informal search groups joined Santa Cruz police, the Santa Cruz County Sheriff’s Office Search and Rescue Team and a specialized state K-9 rescue team overnight and Monday morning in the search for Madyson “Maddy” Middleton reported missing around 6 p.m. at 1030 River St. at the Tannery Arts Center.

Police say Maddy is 4 feet tall, weighs 48 pounds, has long blondish-brown hair and dark eyes. She was last seen riding her Razer Scooter in the Tannery Arts parking lot. Police have received no credible reports of sightings since her disappearance.

Laura Jordan, Maddy’s mother, said Maddy was under a window at the Tannery playing Sunday afternoon when she last saw her. Maddy was supposed to have a play date with another little girl from the complex. While communicating with the child’s mother, she realized Maddy was missing.

Blaschke said the only person of interest in the case is Maddy. Her disappearance appears suspicious, Blaschke said, but police do not necessarily suspect foul play, emphasizing that her parents were cooperating in the investigation.

The scooter has not been recovered, nor has any other evidence of anything Maddy had with her Sunday, Blaschke said.

Jordan, 42, described her daughter as a vocal and smart girl who loves swimming and dancing and has a dog. Jordan, who has lived at the Tannery for about six years, said there are about 350 people living at the Tannery and just about everybody knows each other.

“She knows not to ride around the back of the building because it’s heroin highway,” Jordan said Monday morning.

She said a group of 200 folks fanned out again this morning. Jordan said her daughter has never gone exploring at the river alone, which they call Fairy Glen.

The back of the residential facility at the center is next to a concrete path and a heavily wooded area that leads to the river. The center is across the street from the city’s Homeless Services Center. The area is known for criminal problems relating to drugs and homeless issues.

Jordan said she believes the Tannery Arts Center is safe, but thinks the area outside the center is not and that Maddy knew to stay inside the complex.

“None of us have slept,” said Kirby Scudder, a Tannery resident. “We’ve been at this since 5 o’clock last night.”

“We’re hoping that everyone can help us look for Maddy. This is our child. She lives here,” said Linda Cover, a resident of the Tannery. “The police have been really active. We’re grateful for that. We really want as a community to get the word out.”

Police did confirm that search dogs traced Madyson’s scent to the beach, but said they found no further evidence there.

“It’s not the only element in this case. We’re looking at individuals. We’re looking at neighbors,” Blaschke said.

Madyson was last seen playing outside her apartment complex riding her white Razer Scooter wearing a purple knee high dress with black leggings, a black baseball style helmet and her long dark hair pulled to the side in a braid, police said.

Blaschke said video surveillance at the complex showed Madyson still there at 5:05 p.m. She hasn’t been seen since.

“The Santa Cruz Police Department has flooded the area with additional officers and detectives,” Blascke said. “Officers have scoured the complex and surrounding areas, including the woodland, parks and river levee in an attempt to locate Madyson.”

“We will be working around the clock following up on all leads,” Blaschke said. “Please report any possible sightings. They are crucial to assist in locating the missing child as soon as possible.”

According to court records, Dorian Merredith Middleton, Maddy’s stepmother, sought and received a temporary restraining order against Laura Jordan in 2013 after Jordan allegedly “abandoned her daughter with my husband and I several times.”

Dorian Middleton, 44, of Santa Cruz, is married to Maddy’s father Michel.

In the civil restraining order Dorian Middleton said Jordan also “threatens to make us pay more money if we don’t take care of her child.”

Santa Cruz County Superior Judge Samuel Stevens signed the temporary restraining order in March 2013. The order expired in April 2013 because neither Dorian Middleton nor Jordan showed up at a court hearing then, according to court records.

“We’re looking at all possibilities and all individuals. Nobody’s been ruled out,” Deputy Chief Steve Clark said, though declining to comment on the specifics of any of the family members.

Madyson Middleton primary residence is at the Tannery with her mother. Madyson’s father, Michel Middleton, had a relationship with Jordan but they never married.

The restraining order alleged that Jordan ripped out Dorian Middleton’s hair, swore, fought with her husband and caused her family “emotional distress.”

Dorian Middleton also has a criminal record in Santa Cruz County, having pleaded no contest to misdemeanor malicious disturbance in 2013, according to court records. Santa Cruz police initially arrested her on suspicion of that charge and misdemeanor cruelty to a child by endangering health, according to court records. The child was a 5-month-old and not Madyson Middleton, according to court records.

Michel Middleton was arrested in Santa Cruz in January 2014 on suspicion of lewd acts with a child younger than 14, according to court records. No charges were filed in the case and it was dropped.

“We’re aware of all of those things and we’re considering it in the investigation, but who knows what part that might play,” Clark said Monday afternoon.

Santa Cruz police have said that Madyson’s parents and family have been cooperative with authorities during the search.

“Everybody is just focused on finding this little girl,” Clark said.

Police ask with information that can help to safely locate Madyson Middleton, to call 911. Anonymous tips can also be sent to the police department through the tip line at 831-420-5995, or www.santacruzpolice.com or via text to TIPSCPD plus your message to 274637 (CRIMES).

Community volunteers spent hours Sunday night and Monday morning scouring neighborhoods on their own in search of Maddy. The effort was not part of a law enforcement-organized effort. Hundreds of posts appeared on the Take Back Santa Cruz Facebook page where residents shared their search efforts.