The Erie County Sheriff's office is helping search for two girls who have gone missing.
The girls, Sarah Sullivan-Williams, 15, and Selina Sullivan-Williams, 14, both of Sandusky, were last seen at their middle school in Lorain County at about 8:20 a.m. Thursday, according to Judy Englehart, director of the Erie County Department of Job and Family Services.
A white van pulled up as the girls were outside the school and one willingly entered the white van and the other sister is believed to have entered the vehicle for fear of getting in trouble, Englehart said.
The suspect is believed to be the children's birth mother, Sarah Sullivan, 37, who does not have custody of the children.
"They went willingly with their mother," said Sgt. Donald Barker at the Lorain County Sheriff's office. "We see this a lot of times."
Both girls have been in custody of the Erie County Department of Job and Family Services for about seven or eight years, Englehart said. They were living at a Lorain County foster home. Lorain County Sheriff's office is leading the search.
"We're very concerned about the safety of the children," Englehart said.
Erie County deputies have been assisting with the investigation because the girls have several relatives living in Sandusky, according to Capt. Paul Sigsworth.
The Fremont Police Department also assisted in the case because the mother was living in Fremont, however, officers there were only able to locate the empty white van.