(CNN) -- Police in Bloomington, Indiana, released a photograph Wednesday of college student Lauren Spierer on the night of her disappearance as well as images of a white pickup seen in the area.
The still image of the white Chevrolet truck -- either a Silverado or Colorado from the mid-2000s -- was taken from a video captured by a private security camera, said police Capt. Joe Qualters. He described the truck as a four-door short bed with writing or a logo on the doors and possibly the rear panel.
Qualters said at a Wednesday news conference that the truck did not necessarily belong to a suspect but police were hopeful it might belong to someone who could help shed light on the case.
Qualters said the truck was significant because it twice was in "very close proximity" to the area where Spierer was last seen.
He also showed an image of Spierer wearing a white shirt and black leggings that was taken at her apartment complex before she left home. Spierer, a Indiana University student, disappeared some time after 3 a.m. June 3 after going out with friends to Kilroy's Sports Bar in Bloomington, police said.
Surveillance camera footage from around 2:30 a.m. showed her and a male student, Corey Rossman, returning to her apartment building, Smallwood Plaza.
An altercation with other people occurred there that led to Rossman getting punched in the face, his attorney told CNN affiliate WISH, and he claims he has no memory of what happened after that.
Police have said additional surveillance video from an alley between Smallwood and Rossman's apartment a few blocks away showed them walking toward his building around 3 a.m. Her keys were later found in that alley.
A neighbor of Rossman reported seeing Spierer leave around 4:30 a.m., but police said they found no sign of her after the 3 a.m. sighting on any of the surveillance video they viewed from the blocks between the two buildings.
Qualters said Tuesday that Spierer was wearing a V-neck white shirt that may have had a "distressed" look, with elbow-length butterfly sleeves and a scooped bottom. She also wore black leggings with silver zippers at the ankles.
Spierer had left her shoes, along with her cell phone, at a bar earlier in the night.
Qualters acknowledged that authorities have heard many of the rumors about what may have happened to Spierer and they have not ruled any possibilities out. Still, he warned that investigators need to avoid allowing "the tail wagging the dog" by treating those rumors as facts.
Spierer's mother, Charlene Spierer, who described Lauren as "a sweet, bubbly girl," thanked the family's supporters and said she was trying to remain hopeful.
"I start every day thinking today will be the day, and I go to sleep every night knowing that I have failed and that I haven't done enough," she said Tuesday.
"I love you, Lauren," she added. "I'm ready for you to come home."
Spierer's family is offering a $100,000 reward for information leading to her recovery.
Qualters said Tuesday police have received close to 1,000 tips in their investigation, with about 350 of the tips coming in since "America's Most Wanted" aired a segment on the case Saturday. Police are still sorting through and following up on those leads, he said.
HLN's Stephen Loiaconi contributed to this report.