GAINESVILLE, Fla. -

Police in Gainesville are asking for the public's help in determining where the suspect in a University of Florida student's disappearance was over a 17-hour period, the time-frame 18-year-old Christian Aguilar went missing.

Investigators said they cannot account for Pedro Bravo's whereabouts from 3 p.m. Sept. 20 to 8 a.m. Sept. 21.

Police said Bravo was at Best Buy at 3 p.m. Sept. 20, as seen on surveillance video with Aguilar, his childhood friend. Aguilar hasn't been seen since. Investigators said they also know where Bravo was in Gainesville at 8 a.m. the next day, but they don't know where he was for the time in between.

Police released photos Friday of Bravo's 2004 Chevrolet Blazer (pictured below). They noted the different front right wheel and tire, saying it is hopefully unique enough that someone remembers seeing the vehicle sometime within that time window.

Pedro Bravo's 2004 Chevrolet Blazer Bravo originally told police that he wrecked the Blazer about a week before Aguilar's disappearance, causing him to have to replace that rim, but police said none of that information can be confirmed.

Investigators are also asking for all business owners to check their outside surveillance video to see if that vehicle was seen on video. Police said they've reviewed a lot of video from Gainesville, but they are now seeking areas outside of Gainesville due to the time window being so large.

"We had figured out some sort of a timeline for Christian on the last day he was seen. Now we're kind of switching gears to Pedro's timeline to figure out exactly where he was and see if we can kind of plug in some holes there," Gainesville police spokesman Ben Tobias said.

Anyone who may have captured the SUV on video is asked to call police at 352-393-7670.

When Bravo retained legal counsel, investigators said they reached out to his attorney, but they have not yet responded.

Meanwhile, hundreds of people continued searching wooded areas Friday, eight days after Aguilar vanished.

"The more days that pass, the odds get less and less," Tobias said. "I won't say we are looking for a body at this point, I will not say that, but I will say that we are continuing this search looking for Christian to give the family closure."

Aguilar's younger brother, Alexander, was looking through a scrapbook his family found in Christian's dorm room that he was putting together with drawings and photos as a gift to his parents for their anniversary.

"I want to find him, but at times I don't, not in the sense that, you know, 'cause I don't want to find him in these woods," Alexander said.

Investigators said earlier this week that Bravo bought a shovel and duct tape several days before Aguilar went missing.

Bravo is currently in the Alachua County jail on a charge of depriving a victim of medical care.

Carlos Aguilar, Christian's father, said he had been in contact with Bravo's father until Thursday, but he said Bravo's father is no longer answering or returning his calls.

Carlos Aguilar said his family was going to the jail Friday to try to talk to Bravo themselves. They tried to Thursday, but Bravo denied visitation.

"I don't think it's fair that a person is missing and the only person with information to find him is protected by the Fifth Amendment," Carlos said. "That's ridiculous. We need to be able to have the authorities talk to people like that."