It's been 35 years since the Jonestown massacre, in which more than 900 people died in a mass suicide-murder in Guyana, but a reminder of the horrific event came to light on Thursday.

The remains of nine victims of Jonestown were found in a former funeral home in Delaware, according to The Associated Press. Officials wouldn't release the names belonging to the remains, but they were clearly marked with death certificates.

Delaware's Division of Forensic Science became aware of the remains last week when the property's current owner called police. On the scene, investigators found the remains of 38 people, of which 33 were marked. The deceased dated from between 1970 to the 1990s.

"It's simply a case of unclaimed remains at a closed funeral home," said Kimberly Chandler, spokeswoman for the forensics office, adding that officials don't believe the five unmarked containers contain remains of more Jonestown victims.

The Jonestown massacre happened on Nov. 18, 1978, when Jim Jones, the leader of the Peoples Temple cult in Guyana, orchestrated the suicide of more than 900 people by drinking a cyanide punch laced with other drugs. The suicide happened after gunmen belonging to the cult ambushed a group -- including U.S. Rep. Leo Ryan of California and reporter -- that was looking into the Peoples Temple for alleged abuses.

Before Sept. 11, 2001, the Jonestown massacre was the greatest loss of American life stemming from a single event.

Bodies from the massacre were brought to Dover Air Force Base, which has the U.S. military's biggest mortuary. Several cemeteries declined accepting the bodies until one in Oakland finally accepted. The remaining bodies were cremated or buried in family cemeteries.

CNN reported that the Jonestown remains found Thursday must have gone unclaimed.

Yulanda Williams, who once belonged to the Peoples Temple and spent a few months in Jonestown, told AP that the discovery of the remains is another twist in what's been a strange series of events.

"It's just so sad, for me as a survivor," said Williams, who got out of Jonestown before the massacre. "You consistently wind up finding yourself trying to heal but having your wounds opened up again when new information is given."