Craig Meehan was arrested at the family home
Detectives investigating the disappearance of Shannon Matthews have arrested her stepfather on suspicion of possessing indecent images of children.
Craig Meehan, 22, was arrested after officers on the Shannon Matthews case carried out inspections on a number of computers.
Mr Meehan was arrested at the family home in Dewsbury, West Yorkshire.
Michael Donovan, 39, of Lidgate Gardens, Dewsbury, West Yorkshire, has been charged with kidnapping Shannon.
West Yorkshire Police said in a statement: "During inquiries by the Shannon Matthews investigation team, the contents of a number of computers have been examined.
"As a result of this work, police have arrested a 22-year-old man from the Dewsbury Moor area on suspicion of possessing indecent images of children.
"He is currently being questioned at a West Yorkshire Police Station."
Officers said they did not believe any of the images found on the computer were those of family members.
On Wednesday morning two officers were on duty at the front of the family's red brick home.
Shannon's mother, 32-year-old Karen Matthews was believed to be at a neighbour's home with three of her children.
West Yorkshire detectives were seen going in and out of the house carrying bags and boxes.
Neighbour Peter Brown, 34, said: "We thought we were going back to normality but now all the reporters are back again.
"We thought the next step would be Shannon coming home or at least getting to see her. Now it looks like that could take a while."
Mr Meehan, a fishmonger, has lived at the property with Karen Matthews, a mother-of-seven, for five years.
The nine-year-old schoolgirl was eventually found hidden in the base of a bed at a house a mile from her family home in Dewsbury, West Yorkshire in March, 24 days after she went missing.
But the youngster has not returned home since officers found her and she is in the care of social services.
Her disappearance in February led to the launch of one of the biggest police inquiries in Yorkshire since the Ripper investigation of the 1970s.