"We have two young people who were killed and two families who would like to know what happened, what caused their deaths," said Jason Laughlin, a spokesman for the Camden County Prosecutor's Office.
On Thursday, officials posted two excerpts of the video at http://www.youtube.com/watch?v=DArC0DBI_Mw and http://www.youtube.com/watch?v=AX2W9giWjF4
Shortly after the fire, a police dog detected an accelerant at the scene, officials said. No evidence was found of an electrical fire or an accidental cause.
Laughlin said the fire was suspicious, but investigators had not ruled it an arson because lab tests of charred debris have been inconclusive.
Relatives of the victims have said they do not believe the fire was an accident.
The teens were popular student athletes who focused on their studies and future. He played basketball at Camden High School. She ran track at Woodrow Wilson High School.
Around midnight, Houston sneaked out of her house to be with Holmes. The two fell asleep in the living room.
On June 28, Holmes' father, Kenneth, had been arrested on a domestic violence charge. A girlfriend had found him in bed with another woman and alleged that Holmes pulled a gun on her, Holmes has said. He was in jail the night of the fire. The girlfriend later recanted, and the charges were dropped.
"Due to the surrounding circumstances, we're investigating this as a crime," Laughlin said.
The Prosecutor's Office is offering a $2,500 reward for information leading to the arrest of the person responsible for the fire. Anyone with information is asked to contact Camden County Prosecutor's Office Sgt. Eric Wren at 856-225-8400. Information may also be e-mailed to firstname.lastname@example.org.
Contact Barbara Boyer at 856-779-3838, email@example.com, or follow on Twitter @BBBoyer.