The teenage son of the tribal chairman has been arrested in connection with last week's shootings on a Minnesota Indian reservation, a law enforcement source with knowledge of the investigation said.
Louis Jourdain, son of Floyd Jourdain Jr and a student at Red Lake High School, where most of the killings took place, was arrested on Sunday, the source said on Monday, speaking on condition of anonymity.
Nine people were killed in last Monday's attacks before 16-year-old gunman Jeff Weise, also a student at the school, took his own life.
The younger Jourdain was arrested as part of an investigation into a potentially wider plot, said the source, who gave no further details.
Weise, who had a history of depression, first shot to death his grandfather and his grandfather's girlfriend at a home on the reservation, then went to the school and killed a security guard, a teacher and five students. The grandfather was a tribal police officer.
Investigators said previously that Weise had acted alone in the rampage on the Red Lake Band of Chippewa's reservation. It was the deadliest school shooting in the US since the one at Columbine High School in Colorado in 1999, which ended with the deaths of 12 students, a teacher and the two teen gunmen.
The elder Jourdain has been the official face of the tribe in the days following Weise's attack.
At a news conference last Thursday, he said: ``This is a wake-up call to us all. We need to spend more time with one another and paying more attention to our young people and what they're doing and what they are saying.''
Funerals were held on Monday for Weise and three of his victims. The services for both Derrick Brun, 28, and Weise were held at St. Mary's Catholic Church, and the ceremony for Weise was delayed as Brun's service ran long.
Brun, a security guard credited with saving lives at school by confronting Wiese, was remembered as a hero and a warrior. He was the first person shot at the school.
A security guard who worked with Brun has said he rose from his desk near the school's entrance to confront Weise, allowing her to shepherd other students to safety.
"This young man sacrificed his life without hesitation," said Ernie Stevens, a board member of several American Indian groups. "That is what warriors do."
Earlier on Monday, a service was held in Bemidji for Neva Rogers, the teacher killed by Weise. Witnesses said Rogers had told students to hide and was praying before being shot several times. She was the only non-Indian killed.
At another service on Monday, the body of 14-year-old Alicia White lay in her coffin surrounded by gifts.