In this photo released by the Metro Nashville Police Department, Travis Reinking sits in a police car after being arrested in Nashville, Tenn., on Monday, April 23, 2018. Police said Reinking opened fire at a Waffle House early Sunday, killing at least four people. (Metro Nashville Police Department via AP)

In this photo released by the Metro Nashville Police Department, Travis Reinking sits in a police car after being arrested in Nashville, Tenn., on Monday, April 23, 2018. Police said Reinking opened fire at a Waffle House early Sunday, killing at least four people. (Metro Nashville Police Department via AP)

NASHVILLE, Tenn. (AP) — The mentally unstable gunman suspected of killing four people in a late-night shooting at a Waffle House restaurant was arrested near his apartment Monday after hiding from police for more than a day, authorities said.

Police and federal agents had mounted a massive manhunt in Nashville for 29-year-old Travis Reinking after the Sunday morning attack, in which a gunman clad only in a jacket opened fire with an assault rifle on a diverse crowd at the restaurant before a customer disarmed him.

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Reinking was formally charged late Monday with four counts of criminal homicide and held on a $2 million bond, court records show.

Construction workers told officers earlier Monday that a person matching Reinking’s description walked into the woods near a construction site, Metro Nashville Police Department Lt. Carlos Lara told reporters. A detective spotted Reinking, who lay down on the ground to be handcuffed when confronted, Lara said

Reinking carried a black backpack with a silver semi-automatic weapon and .45-caliber ammunition, Lara said. Detectives cut the backpack off him while he was cuffed.

Police spokesman Don Aaron said Reinking requested a lawyer and was taken to a hospital before being booked into custody.

It’s not clear why Reinking attacked shortly after 3 a.m. Sunday, though he may have “mental issues,” Nashville police Chief Steve Anderson said earlier.

Police said Reinking opened fire in the restaurant parking lot before storming the restaurant, which had about 20 people inside. Four people — three of them black and one Hispanic — were killed and four others injured before a customer wrestled the weapon away and Reinking, who is white, ran out, police said.

Police said Reinking stole a BMW days before the attack. The car was quickly recovered, but authorities did not immediately link the theft to Reinking.

Meanwhile, authorities in Illinois shared past reports suggesting multiple red flags about a disturbed young man with paranoid delusions.

In May 2016, Reinking told deputies from Tazewell County, Illinois, that music superstar Taylor Swift was stalking him and hacking his phone, and that his family was also involved.

Reinking agreed to go to a local hospital for an evaluation after repeatedly resisting the request, the sheriff’s report said.

Another sheriff’s report said Reinking barged into a community pool in Tremont, Illinois, last June, and jumped into the water wearing a pink woman’s coat over his underwear. Investigators believed he had an AR-15 rifle in his car trunk, but it was never displayed. No charges were filed.

Last July, Reinking was arrested by the U.S. Secret Service after he entered a restricted area near the White House and refused to leave, saying he wanted to meet President Donald Trump. Reinking was not armed, but at the FBI’s request, Illinois police revoked his state firearms card and seized four guns from him, authorities said.

The AR-15 used in the shootings was among those seized.

In August, Reinking told police he wanted to file a report about 20 to 30 people tapping into his computer and phone and people “barking like dogs” outside his residence, according to a report.

“There’s certainly evidence that there’s some sort of mental health issues involved,” Tazewell County Sheriff Robert Huston said. But he said deputies returned the guns to Reinking’s father on the promise he would “keep the weapons secure and out of the possession of Travis.”

Reinking’s father “has now acknowledged giving them back” to his son, Aaron said.

Bureau of Alcohol, Tobacco, Firearms and Explosives special Agent Marcus Watson said Monday that his action is “potentially a violation of federal law.”

Phone calls to a number listed for the father, Jeffrey Reinking, went unanswered.

It is not clear why Reinking moved recently from Morton, Illinois, and if it had anything to do with being near Swift, who has a home in Nashville. Police say he worked in construction for a while.

Police say Reinking drove into the Waffle House parking lot in his gold Chevy Silverado pickup early Sunday and sat there for about four minutes before opening fire.

The victims fatally shot in the parking lot have been identified as Taurean Sanderlin, 29, of Goodlettsville, and Joe Perez, 20, of Nashville. Sanderlin was an employee at the restaurant.

One of the fatally wounded inside was DeEbony Groves, a 21-year-old student at Nashville’s Belmont University. She was remembered as an exceptional student who made the dean’s list and a tenacious basketball player.

Akilah Dasilva was also killed inside the restaurant. The 23-year-old from Antioch was a rap artist and music video producer, The Tennessean reported.

He was at the Waffle House with his girlfriend, 21-year-old Tia Waggoner, the newspaper said. Waggoner was wounded and underwent surgery to try to save her leg, Dasilva’s family said. Police say Sharita Henderson, 24, of Antioch, was wounded and being treated as well.

Also wounded was James Shaw Jr., a 29-year-old restaurant patron who burned his hand grabbing the hot muzzle of the assault weapon as he wrestled the gun away. A Nashville native who works as a wireless technician for AT&T, Shaw said he was no hero — despite being hailed as one by Nashville Mayor David Briley.

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Associated Press writers John Raby in Charleston, West Virginia; Ed White in Detroit; and Justin Pritchard in Los Angeles contributed to this report.