Two parents have been arrested in California after police found 13 people allegedly being held captive at their home, including some "shackled to their beds with chains and padlocks".
David Allen Turpin, 57, and Louise Anna Turpin, 49, were held on charges of torture and child endangerment.
The 13 people - aged between two and 29 - were found in a house in Perris, 59 miles (95km) south-east of Los Angeles, police said on Monday.
They are all believed to be siblings, according to a BBC report.
Officers were alerted by one of the victims, who on Sunday managed to escape and call the emergency number "from a cellular device she found inside the house", the Riverside Sheriff's Department said in a statement.
The girl - who police said appeared to be "only 10 years old and slightly emaciated" - claimed that 12 of her siblings were being held captive by their parents.
Police officers later found "several children shackled to their beds with chains and padlocks in dark and foul-smelling surroundings".
But the parents were unable to immediately provide a logical reason why their children were restrained in that manner, the police said.
The officers were "shocked" to discover that seven of those held in the house were actually adults aged between 18 and 29.
"The victims appeared to be malnourished and very dirty," the police said.
All the victims are now being treated in local hospitals.