The parents of a teenager suspected of a deadly school shooting have been arrested in a Detroit basement hours after going on the run, police say.
James and Jennifer Crumbley were found unarmed hiding in a warehouse after a tip-off from someone who saw their car.
They are accused of ignoring warning signs before their son's alleged rampage.
Prosecutors say Ethan Crumbley, 15, used his father's gun to shoot classmates in the nearby Michigan town of Oxford, killing four and wounding seven.
Detroit Police Chief James White told reporters that Ethan's parents had been taken into custody without incident.
"They were very distressed as they were walking out," he said.
He said they had been aided in getting into the building, which he said was used as an art studio, and that the person who helped them could face charges.
The Crumbleys' lawyer had earlier told the BBC that the couple had left town on the night of the shooting "for their own safety" and were not fleeing police.
But reports in the US say police knew the couple had withdrawn $4,000 (£3,000) from an ATM in Rochester Hills on the edge of Detroit and had turned off their mobile phones.
Ethan Crumbley is alleged to have opened fire on fellow students and teachers at his school in Oxford, about 35 miles (60 km) north of Detroit, on Tuesday.
The four killed were Tate Myre, 16, Madisyn Baldwin, 17, Hana St Juliana, 14, and Justin Shilling, 17.
Ethan Crumbley is being charged as an adult, and is facing one count of terrorism, four counts of first-degree murder, seven counts of assaults with intent to murder and 12 counts of possession of a firearm.