Three days after saying they were “grasping at straws” in the search for a missing 57-year-old grandmother, Winnipeg police have released images of three more people with whom they wish to speak.

Police are hoping that the potential witnesses will come forward, or that someone will be able to identify them.

Thelma Krull, an administrative assistant, disappeared while out for a walk on the morning of Saturday, July 11.

Her husband, Robert Krull, said they had arranged to meet at a Canadian Tire store at 10 a.m., but his wife did not show up. Krull was supposed to pick up a cake for her grandson’s birthday party later that day.

Thelma Krull

A surveillance camera captured Krull walking briskly down a residential street at around 7:45 a.m.

She hasn’t been seen since, but her eyeglasses were found near the Valley Gardens Community Club.

Const. Jason Michalyshen said Monday that the three people seen in the images were all in the area of Kildonan East High School and the Valley Gardens Community Club around 8 a.m. on July 11.

“There’s always that potential that they hold some very pertinent information that can move this investigation forward,” Michalyshen said as he appealed for the people in the footage to contact police.

The new images are in addition to footage of two people on bicycles that police released on Friday.

Thelma Krull

Const. Eric Hoffley said at the time that investigators were “grasping at straws.”

Police continue to urge anyone with video surveillance systems to check their footage for signs of Krull.

In the early days of the search, police had asked people to check outbuildings, green spaces and vehicles on their properties in case Krull had suffered a medical problem.

Krull, is described as Caucasian, 5-foot-4, 170 pounds with short, dyed blonde hair with a purple streak. She was last seen wearing black capri-style pants, a reddish-orange shirt, hiking boots and glasses.

The disappearance has caused fear within the community. Neighbour Roland Gibson said last week that he had changed his routine. "I don't go out walking on my own now,” he said.

With a report from CTV Winnipeg