DALLAS — Neiman Marcus reopened its downtown store Saturday with memorials in the windows and at its store at NorthPark Center. But downtown remained eerily quiet following the sniper attack on police during a protest Thursday evening.

Traffic Los Angeles and Tenoversix, which are both located at the Joule Hotel, reported seeing few customers Friday, with a little improvement Saturday. “It was very quiet Friday,” said Amanda Reed, manager of Tenoversix. “It’s definitely a sad time. Saturday is a little better but there have been some cancellations around the [Joule] and it’s still not as busy as a normal Saturday.”

Nerves were jittery given the bomb threat Friday evening at the Manor House apartments downtown and a threat to the Dallas Police Department at 4 p.m. on Saturday left officials on high alert. “Right now a SWAT team is headed to the Dallas Police headquarters,” Patrick Ware, general manager of Traffic Los Angeles noted. “Our shoppers in the next two or three days will feel comfortable coming downtown.”

SWAT officers surrounded a garage behind the Dallas Police Department headquarters after the sighting of a suspicious person.

Stores in downtown Dallas had closed Friday, as well as Neiman’s headquarters, following the attack Thursday that killed five Dallas police officers and wounded seven others, including five other policemen.

“The tragic news the city of Dallas has woken up to has affected us deeply,” said Karen Katz, president and chief executive officer of Neiman Marcus Group, on Friday. “Our thoughts and prayers go out to the families of the five officers killed in the line of duty and the many more injured. Out of respect for the lives lost and to ensure the safety of our associates and customers, the Neiman Marcus corporate offices and the Downtown store will be closed today.”

Corporate employees worked from home, a spokeswoman said.

Neiman’s is only steps away from the 20-block area that is closed to traffic as police investigate the shootings that felled five police and transit officers and injured seven more along with two civilians.

Traffic Los Angeles men’s and women’s stores and Tenoversix at the Joule Hotel opened Friday, according to Jeny Bania, spokeswoman for Headington Cos., which owns the Joule and invested in the Dallas branches of the California retailers. “It’s a customer service amenity of the hotel, and we’re here to serve the district and our guests,” Bania said. “There is traffic going up and down Main Street. It’s still a downtown that is functioning, at least at this corner.”

But Walter Love, manager of the Jos. A. Bank store on Commerce Street across from the Joule, described downtown as “a ghost town” Friday morning and speculated it will remain quiet through the weekend.

“It will probably get back to normal on Monday,” Love said.