By Holly Yan and Artemis Moshtaghian, CNN

(CNN) -- Police warn that a seminude gunman accused of killing four people early Sunday at a Waffle House near Nashville is on the run and is armed and dangerous.

Authorities suspect that the 29-year-old Travis Reinking of Nashville, Tennessee, may have two weapons on him -- a long gun and a hand gun. A police helicopter and a police dog tried to track the suspect after the shooting but the dogs lost the scent, authorities said.

The Tennessee Bureau of Investigation on Sunday added Reinking to its "Top 10 Most Wanted" list, according to authorities.

"Keep your doors locked, keep your eyes open. If you see this individual -- if you see a nude guy walking around this morning -- call the police department immediately," Metro Nashville police spokesman Don Aaron said.

The melee started around 3:23 a.m. (4:23 a.m. ET) in Antioch, southeast of Nashville.

After sitting in the truck for a few minutes, the gunman came out wielding an "assault-type rifle" and fatally shot two people outside the Waffle House, police said.

"He then went inside the restaurant (and) continued firing," Aaron said.

Some witnesses suffered cuts on their faces from shattered windows. Two more victims inside the restaurant were fatally shot.

Chuck Cordero, who was on break from his job as a 24/7 roadside serviceman, was about to walk in to the restaurant when the shooting took place.

"I was very lucky -- where I usually sit, one woman was killed and another was shot," he told CNN. "I was very fortunate to have not gone into the Waffle House and sat in my car."

Cordero added: "My friend 'T,' the cook at Waffle House, died trying to get away."

Authorities identified the dead as Waffle House employee Taurean C. Sanderlin, 29, of Goodlettsville, Tennessee; Joe R. Perez, 20, of Nashville; and Akilah Dasilva, 23, of Antioch. The identity of a fourth victim, a 21 year-old woman from Gallatin, Tennessee, who was fatally wounded in the restaurant, has not been released.

Sanderin and Perez were shot as they stood outside outside the restaurant, authorities said.

Shanita Waggoner, 21, of Nashville, and Sharita Henderson, 24, of Antioch, were injured and are being treated at Vanderbilt University Medical Center.

'He is the hero'

The carnage stopped only because of the heroics of a customer who heard the gunshots and hid near the restaurant's bathrooms.

Police said the customer, identified by a relative as James Shaw Jr., monitored the gunman's moves from afar and jumped into action when he saw an opportunity.

"He saw the gunman looking at his rifle. At that point, the shots had stopped. So he decided to rush the gunman, actually wrestled that assault rifle away, tossed it over the counter. At that point, the gunman then fled," Aaron said.

"He is the hero here, and no doubt he saved many lives by wrestling the gun away and then tossing it over the counter, and prompting the man to leave," he added.

Police said Reinking shed his jacket and fled on foot. Later Sunday morning, he apparently "clothed himself with a pair of pants," Aaron said.

"A man believed to be Travis Reinking was last seen in a wood line near Discovery at Mountain View Apts. on Mountain Springs Drive near the Waffle House," police tweeted. "The man was seen wearing black pants and no shirt."

Authorities recovered Reinking's jacket nearby, which had two magazines for AR-15 ammunition, Aaron said.

"He clearly came armed with a lot of firepower, intending to devastate the south Nashville area," Aaron said.

Suspect was once arrested near White House

In July 2017, the United States Secret Service arrested Reinking for being in a restricted area near the White House in Washington, police said.

Authorities in Tazewell County, Illinois, and the FBI interviewed Reinking, Aaron said. At the FBI's request, Reinking's Illinois firearms authorization was revoked, and four weapons -- including the AR-15 used in the Sunday's shooting -- were seized, Aaron said.

Tazwell County authorities later returned the guns to Reinking's father, who acknowledged giving them back to his son, Aaron said.

Authorities so far have recovered two weapons, including one found Sunday at Reinking's apartment, Aaron said. But they are concerned he may have the two other weapons that were not found in his home.

Suspect worked in construction

Reinking is believed to have moved to the Nashville area last fall. He worked in construction and was fired from a job about three weeks ago, Aaron said.

The suspect started with another construction company last Monday but did not show up for work the next day, Aaron said.

Authorities have started drafting murder warrants against Reinking. But so far, the motive for the shooting remains unclear.

Waffle House, which has more than 1,500 locations across the country, offered its condolences.

"This is a very sad day for the Waffle House family," the restaurant chain tweeted. "We ask for everyone to keep the victims and their families in their thoughts and prayers."

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