Authorities Saturday were holding a man suspected in a double homicide and arson in Los Angeles, while Denver police arrested the man's brother an hour before.

At the request of California authorities, two Emery County deputies and two detectives stopped a bus Friday that was traveling from Los Angeles to Denver, Sheriff Lamar Guymon said.Lonnie Dave Lewis, 29, was "being held here for Los Angeles," said Emery County sheriff's dispatcher Bliss Mead. "We're just waiting to hear back from them."

Los Angeles police detective Wayne Horton said three men tied up a couple and raped another woman before setting all three victims on fire.

The woman was shot in the arm when she tried to flee, authorities said. Sylvia Davis, 45, and Lee Gottstein, 57, died in their burning apartment.

"When the fire department came to put out the fire, they found the two bodies inside," Horton said. "They died of smoke inhalation and burns."

The other woman was later found outside the burning two-story building.

"The fire was started to eliminate the witness and cover any evidence of the robbery," Horton said.

"We know it was a robbery because there was a trail of money leading from the victims down to the street," he said.

Lewis attempted to flee when the officers approached him, Mead said, but was easily apprehended.

His brother, Jerome Martin, 21, was arrested six blocks from their mother's Denver home when his vehicle slammed into a parked car after a brief police chase.

Denver police set up surveillance units outside Martin's mother's house shortly after Lewis' arrest.