HAVERHILL, N.H. – Grand jury witnesses who testified this week in the Dartmouth College murder case apparently were asked about the teen suspects, knives and possible links with the victims.

Tim Courts of Chelsea, Vt., was one of nine people subpoenaed in the case. He did not testify Monday, but his son Zack, 17, was questioned for about 45 minutes about his friendship with the two Chelsea, Vt., teens charged with the murders.

The elder Courts told The Boston Globe his son was asked repeatedly about whether Rob Tulloch, 17, and James Parker, 16, owned different types of knives.

Tulloch and Parker were arrested Feb. 19 in Indiana following a nationwide manhunt. Each faces two counts of first-degree murder in the stabbing deaths of Half and Suzanne Zantop in their isolated home in Hanover on Jan. 27.

Tim Courts also said his son was asked whether Parker or Tulloch had mentioned the Zantops to him. They had not, his father said.

Zack Courts also was asked about the suspects’ whereabouts on certain days before and after the killings, and was assured by prosecutors he was not viewed as a target of the investigation.

“You don’t like to feel that your boy is going into a prosecution and being asked questions about knowledge he didn’t have,” Tim Courts said. “But it didn’t go like that. It wasn’t adversarial.”

The investigative panel, meeting privately in Grafton County to decide whether to issue any indictments, met again Tuesday. Apparently, the only witness was Gaelen McKee, 15, another friend of the suspects from Vermont. He said Monday’s session was tiring, but left Tuesday with a wave and no comment.

Assistant Attorney General Kelly Ayotte would not comment Tuesday on how many witnesses appeared, who they were or whether their information was of value to the investigation.

Tulloch’s sometimes girlfriend is to appear before the panel on April 20.

Tulloch is being held in Grafton County Jail while Parker is being held in a juvenile center in Concord.

The boys’ parents will not be called to testify before the grand jury. Lawyers for Parkers and Tullochs said Monday their clients had given private interviews to authorities.

“They agreed to not contest the subpoena, however last Friday the Tullochs met informally with investigators and answered their questions,” said George Ostler, a lawyer for Diane and Michael Tulloch.

“As a result, they were released from their subpoenas and will not be appearing before the grand jury.”