GUILDERLAND — Guilderland Police Chief Carol Lawlor updated the public Sunday afternoon on the shooting incident at Crossgates Mall, saying that while there are leads in the case, there have been no arrests.

Lawlor also confirmed there was one shot fired, and that the incident involved two people arguing.

Meanwhile, the mall opened at 11 a.m., allowing those an opportunity to retrieve personal items they left behind in the rush to evacuate after the alleged incident was reported around 2:20 p.m.

The mall is open for regular business from 11 a.m. to 6 p.m Sunday.

Police continued to comb Crossgates Mall late into Saturday night after a report that shots were fired sent shoppers running for exits and hunkering down inside stores — where some remained for hours. Four to six police teams swept the mall until 10 p.m. Saturday - resulting in some employees and customers being trapped for six to seven hours.

Just after 9 p.m. Guilderland Police Chief Lawlor said there was no suspect in custody and no victims were located. She said about 10 percent of the mall still needed to be searched and that some shoppers still remained inside.

She said police continue to search for a suspect seen on video, a black man who is around 6 feet tall and 200 pounds wearing a white shirt with a black hoodie. Two people detained earlier were not involved in the incident, Lawlor said.

"We have no reason to believe that people aren't safe at home," Lawlor said. "Of course, we ask people to be vigilant. If you see something, say something."

She asked for anyone with photos or video of the incident to share them with police.

Crossgates Mall management said it is cautiously optimistic the mall will reopen at 11 a.m. on Sunday. Also, any personal property left at the mall has been secured.

A report of shots fired was made around 2:20 p.m. and centered on the area near the Apple store, Lawlor said.

As police initially responded around 10 minutes after the report, shoppers started to pour from the mall's exits, while others hid inside stores anywhere from 25 minutes to many hours. In the parking lot outside, where hundreds of police swarmed, many with weapons drawn, the mood among the people who made it out was mixed. Some people were distraught and tearful, others were confused, while some did not seem fazed at all.

Lawlor first spoke to the media around 4:30 p.m., saying they responded with the assumption it was a real shooting. The mall was safely evacuated following plans that the police and mall officials have drilled for, she said.

"Hopefully we will bring this to a successful conclusion," Lawlor said.

State police Maj. Bill Keeler told the Times Union Saturday afternoon that it "seems like a confrontation between two men and they've fled the scene."

Police were working with the mall's management and continued to sweep the stores. Establishments at the mall were locked down and perimeter roads and ramps into the mall were closed for a time during the response. Police asked drivers to avoid the area. Mall customers were sent to a gathering area where they could be picked up by relatives or friends.

One group that was shopping at Swarovski on the mall's second floor recalled hearing what sounded like someone dropping a very heavy object in the store below.

After the initial sound caught their attention, they described a roughly five-second delay, then two more pops that were closer together.

Another group that was shopping at the GameStop described a wave of people suddenly running at them, yelling "run." The group thought those running "were late to catch a bus or something" before they realized what was happening. They immediately started running, though they said they did not hear any gunshots.

About 20 armed police just stormed up the hill at Crossgates Mall. Not sure what's going on yet, but pretty chaotic. Place locked down. pic.twitter.com/uMd5frvdm8 — Robert Downen (@Robert_Downen) November 12, 2016

(1 of 2) Guilderland Police Chief Carol Lawlor speaks with media at Crossgates Mall. pic.twitter.com/E3ZbfpiFqq — Robert Downen (@Robert_Downen) November 12, 2016

(2 of 2) Guilderland Police Chief Carol Lawlor speaks with media at Crossgates Mall. No victims as of now. pic.twitter.com/fEecCEoYhG — Robert Downen (@Robert_Downen) November 12, 2016

"I heard a woman screaming for someone to come back to her," said Kellen Riell of Schenectady, who was at Starbucks on the mall's second floor. "Everyone in the store turned and looked out the door. People in corridor outside just started running, like it was a race."

"The store emptied out. All these people were running in one direction toward the Macy's and then they started running on the other direction," said Riell, who works at the Times Union.

Riell stayed inside the store with close to 20 customers and employees and watched as mall security guards directed people in the mall to the exit in an orderly manner. At the same time, he said, employees started locking all the stores — the jewelry store across the hall was pulling down its shutters.

Starbucks manager Joe Farina then ushered everyone to the back of the Starbucks and locked the store entrance.

"We were at the back of the store for a few minutes and then the staff members let everyone into the employee-only room," Riell said.

About 20 minutes later, through the small window in the staff room door, Riell saw four police officers walking abreast with guns drawn pass the store in both directions. They had their free hands on each other's shoulders, forming a chain.

The manager stayed out in the store so he could watch was going on.

Riell said he was holed up at Starbucks for a bit more than an hour before he was evacuated at 3:45 p.m. For the most part, he said people in the room were glued to the screens of their phones, but they kept the mood light.

Customer Brian Mertik, who was there with two of his sons, kept watch at the window and reassured those around him, saying "this is nothing."

"The security guards didn't miss a beat. It was like they were drilled on this," Riell said.

"That's the thing that impressed me the most. The guards and the manager at Starbucks immediately did what they were supposed to do. There was no hesitation."

John Barrella, a general manager at one of the mall's chain restaurants, said one police officer told him it could take upwards of nine hours to secure the two-story mall.

The children's movie "Trolls" was just rolling through the ending credits at Regal Cinemas when a staffer came in, turned on the lights and told everyone there was an "incident" — without providing any details — and that they were not allowed to leave.

Patrons quickly turned to their phones and Twitter to see what they could learn. They were asked to stay in the theater, which started to get hot inside, though many walked into the hallway to use the bathrooms and cool down.

Two hours after the movie ended, law enforcement with heavy artillery arrived to escort hundreds of patrolsn from the theater.

Hours after police responded to the report of shots fired, the initial chaos and confusion of the scene had mostly dissipated. Occasional sirens could be heard in the cold air, and a police helicopter hovered above the mall as dusk set in.

Spontaneous Evacuations as Search for Shooter continues at Crossgates Mall. pic.twitter.com/tUgaS59ygY — Michael P. Farrell (@MfarrellP) November 12, 2016

John Barrella, GM restaurant at Crossgates Mall, describes what he heard around time of reported shooting. pic.twitter.com/CaV2WlaMLM — Paul Nelson (@apaulnelson) November 12, 2016

Occasional sirens, but besides that, scene outside seems to have calmed down a bit. pic.twitter.com/1TaZIfz7MM — Robert Downen (@Robert_Downen) November 12, 2016

Lawlor said many people fled "with everything they have, and that's something we'll have to deal with."

Personal property left in the stores and common area "is in good hands," said Joe Castaldo, director of shopping center management for the Pyramid mall company.

Police said they will maintain a presence at the mall when it opens at 11 a.m. Sunday.

Guilderland police were joined in responding by State Police, the Albany County Sheriff's Office, the FBI and police departments from Albany, East Greenbush and Troy.

Lawlor said police talked to hundreds of people as part of their response.

Last month, Albany County Sheriff Craig Apple spoke to the Times Union about active-shooter training for law enforcement and described such an incident at Crossgates Mall as a "nightmare." Still, he said, his office has devised a full emergency response plan for the mall, which lays out a traffic pattern and coordinates seven law enforcement agencies.

It all appeared to work on Saturday.

Contributing: Emily Masters, Lauren Stanforth