CONCORD, N.H. (AP) – After vainly searching for a week, authorities went public Tuesday with an old-fashioned hand water pump, abandoned sewer pipes and other details about where they believe Manual Gehring buried his two children.

They said the site, somewhere in the Midwest, is a rural, grassy area within 10 miles of Interstate 80 about 50 feet from a two-lane road.

Though they are concentrating on a 190-mile span across Indiana to Joliet, Ill., they said the full search area runs from Grove City, Pa., to Iowa City, Iowa, a distance of nearly 700 miles.

“We need the public’s help,” state Attorney General Peter Heed said at a news conference. “This is a case where because the potential site covers so many hundreds of miles …. the farmer, the fisherman, the kids, the high school people, the local police officers, townspeople, may know some of these specific facts.”

He and FBI Special Agent Jay Fallon said the site has a 6-foot-high wire fence; several large shade trees similar to willows, but with darker leaves; a pile of weathered firewood; and a large yellow or tan building nearby.

Authorities again refused to say the source of their information, though they acknowledged Gehring spent a week with investigators in the Midwest, spending nights in various jails.

They said the site description was accurate as of July 5, indicating the children were buried that day, and that the burial was during daylight hours.

Authorities said there is a $5,000 reward for information that leads to the discovery of the site.

An indictment announced Monday accuses Gehring, 44, of shooting 14-year-old Sarah and 11-year-old Philip to death in New Hampshire sometime around July 4, when the children were last seen after fireworks in Concord.

The unemployed accountant was arrested in California on July 10. Two days later, authorities said they believed both children had been killed.

Gehring was brought back to New Hampshire on Tuesday afternoon. Gehring, who was handcuffed and wearing a bulletproof vest, looked down as police escorted him from the plane at Concord Airport to a police cruiser. Authorities expected him to be arraigned Wednesday.

About 20 people gathered at the airport, including Autumn Nault, who was a cheerleader with Sarah Gehring at Concord High School.

“I wanted to see her father,” she said. “I wanted to see if he felt guilty.”

Authorities also said the center seat of the van Gehring was driving was missing when he was arrested. They believe it was left somewhere off I-80 in Nebraska.

Nebraska State Patrol spokeswoman Terri Teuber said she had no knowledge of that. “We were contacted last week and asked to assist as needed, but there has been no further contact,” she said.

The FBI, state and local police have searched for the bodies along the Concord-to-California route Gehring drove in the days after the alleged murders.

Gehring had been in a custody battle with his ex-wife. Authorities said he did not return the children to her July 6, as agreed. Gehring’s ex-wife, Teresa Knight, said in court papers July 7 that he had told her in a “very agitated and angry” call that he had no intention of abiding by a new custody agreement.

Authorities said Gehring and his daughter argued loudly after the fireworks. According to prosecutors and court records, both children were crying as they walked to his car.

His trip was traced across the country using credit card transactions.