Police in California are searching for a woman whose 17-year-old nephew allegedly escaped captivity and went to a gym with a shackle on his ankle. Police believe the boy’s aunt was somehow involved.

The boy ran away from a Sacramento group home 15 to 18 months ago. The teenager had been missing until Monday afternoon when he showed up seeking help at a gym in Tracy, California, said Matt Robinson, spokesman for the Tracy Police Department. Club employees found the boy, who was scared, covered of bloody wounds and wearing only a pair of oversized boxer shorts, and called police. The boy was terrified and he kept saying “hide me, hide me.” Officers talked to the boy, who was then taken to a nearby hospital as he suffered from bruising, cuts and malnutrition. Some witnesses said the boy had jumped over a fence to get to the fitness center, according to local reports.

Police officers arrested Michael Luther Schumacher, 34, and Kelly Layne Lau, 30, of Tracy on suspicion of conspiracy, torture, kidnapping, child beating and false imprisonment.

The teen was held against his will at the home of the suspects about 500 feet from the fitness center, Robinson told reporters. Police officers found four other children belonging to Schumacher and Lau, ages 1, 3, 7 and 9, at the couple’s home. They were taken by the San Joaquin County Child Protective Services and showed no signs of abuse, Robinson said.

Robinson suggested that the teen escaped the foster home and somehow reunited with the aunt.