LAS VEGAS — The gunman who killed 58 people in the worst mass shooting in modern U.S. history targeted aviation fuel tanks, stockpiled his car with explosives and had personal protection gear as part of an escape plan, the Clark County sheriff said Monday.

Sheriff Joe Lombardo said at a news conference that they still have not pinpointed the shooter’s motive behind his decision to fire on a concert crowd of 22,000 in Las Vegas on Oct. 1 from the 32nd floor of the Mandalay Bay hotel casino.

There’s still no evidence Stephen Craig Paddock was motivated by ideology, and there’s no evidence there was another shooter, he said. Investigators have found 200 incidents of Paddock moving through the city, and at no time was he with anyone else, Lombardo said.

They haven’t found any one particular event in Paddock’s life that triggered the shooting, he said. They didn’t find any note in his room, only a paper with numbers, he said.

Lombardo also confirmed investigators are talking with Paddock’s brother Eric Paddock, who traveled to Las Vegas, and continue to speak with the shooter’s girlfriend, Marilou Danley, to get insight.

Lombardo declined to reveal what they’ve said, but stated, “Every piece of information we get is one more piece of the puzzle.”

Friends and relatives of the victims and other concert-goers who survived returned Monday to reclaim baby strollers, shoes, phones, backpacks and purses left behind in the panic as they fled.

The interviews with Paddock’s brother Saturday and Sunday were part of an exhaustive search through the 64-year-old’s life in search of clues about why he unleashed gunfire from broken windows in the 32rd floor of the Mandalay Bay hotel casino.

Eric Paddock declined to say what he was asked, but he said he’s cooperating with investigators, according to the Las Vegas Review-Journal. He declined interview requests from The Associated Press.

“I’m trying to get them to understand Steve’s mindset,” Eric Paddock told the newspaper. “I don’t want them to chase bad leads.”

In a newly revealed court document obtained by CNN, Stephen Paddock described himself as a nocturnal creature who bet up to $1 million each night while gambling at Las Vegas casinos in flip-flops and sweatpants, catching sleep in the day. The description of his lifestyle comes from a deposition filed as part of a civil lawsuit he filed against Cosmopolitan Hotel, where he slipped and fell in 2011.

Some of the victims have already been returned home and been memorialized at funerals while many others were in route on Monday ahead of services planned for later dates.

More than 800 people packed into a California church on Saturday to honor the life of Jack Beaton, who died shielding his wife from gunfire. A white hearse carrying the casket of Christopher Roybal, a veteran who served combat during Eric Paddock said he came to Las Vegas to retrieve his brother’s body in hopes of sending the cremated ashes to their 89-year-old mother in Orlando.

Clark County Coroner John Fudenberg said Monday he could not discuss the results of an autopsy done on Stephen Paddock, who police said shot himself dead.