A tip suggesting missing college student Mollie Tibbetts (pictured) was found in Missouri was found to be incorrect

A hog farmer with two prior stalking convictions had his home searched, his cell phone taken and was interviewed for two hours on Tuesday as police continue to search for missing Mollie Tibbett.

Wayne Cheney told FOX news multiple officers took pictures of the inside of his home - which is walking distance from the hog farms police recently searched, and took him away from the property for an interview.

'I don't know who those two [officers] were but they took me down to the fire station Tuesday and questioned me for two hours.' he told the WHO13.

'I don`t remember what they asked me.'

Police have declined to say if Cheney is a suspect. The farmer says he doesn't know the Tibbett family but said he hoped they would all be reunited soon.

And officers aren't the only ones throwing themselves into the search.

On Thursday, Mollie's mother Laura Calderwood told reporters a reward fund for information leading to the college student's safe return had skyrocketed to $172,000.

The fund is growing through generous donations.

Police photographed the inside of Wayne Cheney's home, took his cell phone overnight and took him away from the property to be questioned

Ms Calderwood said can feel her daughter 'sitting on her shoulder', and is drawing strength from the 20-year-old.

An anonymous tip line has received more than 200 calls since Monday, including one suggesting Mollie was seen at a truck stop in Missouri, about 240 miles from Brooklyn, Iowa, where she lives.

The 20-year-old was thought to have been spotted at a truck stop near the near I-35 and Missouri 92 Highway - 240 miles from her boyfriend's home, where she was last seen two weeks ago.

But the Kearney Missouri Police Department said in a statement while they: 'Conducted a thorough search of the area, spoke with all possible witnesses, and reviewed all available video footage', the sighting was a dud.

Mollie Tibbetts' mother Laura Calderwood (pictured) announced a reward fund for information about the 20-year-old's whereabouts had hit $172,000

Cheney (pictured) has previous stalking convictions, but says he does not know anything about Mollie's disappearance

Tibbetts was last spotted jogging in the small town of Brooklyn, Iowa on the evening of July 18.

Her family reported her missing a day later when she failed to show up for work and authorities have since embarked on a wide-scale search for the University of Iowa psychology major.

Despite the lack of information or substantiated sightings, the college student's father, Rob Tibbetts, and her boyfriend Dalton Jack, say they are still confident she will make it home.

'We couldn't keep going if we didn't think she was coming home,' Mr Tibbetts told the Des Moines Register.

Mollie was thought to have been seen at a truck stop in Missouri - some 240 miles away from her home town, but the police could not find any substantial evidence she was ever there

Tibbetts had been staying at her boyfriend Dalton Jack's home in Brooklyn while he was working a construction job 120 miles away. He said he received a Snapchat from her that night

He said Jack and the Tibbetts family have spoken constantly about the missing woman and what they'll do when she's home.

'One of her brothers said yesterday: "We're going to make her watch every one of these interviews back to back",' Mr Tibbetts laughed.

On Thursday, Mollie's father Rob Tibbetts announced an anonymous tip line with a $30,000 reward

During Thursday's press conference, he told reporters the family had been waking up at 2-3am every day to continue the search, and pleaded for anyone who knew anything at all to call the line.

'If you have nothing to hide you have nothing to fear, so come forward,' he said.

'Let's bring Mollie home.'

Mollie had been staying at her boyfriend Dalton Jack's home in Brooklyn the night she disappeared.

Jack shares the house with his brother Blake and his fiancee Aimee Houghton, who were due to marry in the Dominican Republic this week. They have since canceled their wedding as the search continues.

Authorities have embarked on a wide-scale search for the University of Iowa psychology major since she vanished on July 18

Police in Kearney, Missouri say they received a report on July 26 that a woman matching Mollie's description had been spotted at a truck stop near I-35 and Missouri 92 Highway - but could not find any evidence she had been there

This is the house in Brooklyn, Iowa, where Mollie disappeared from on the night of July 18. Her boyfriend Jack shares the house with his brother Blake and his fiancee Aimee Houghton

The 20-year-old went out for a jog that night but is thought to have returned home and studied late into the evening.

Dalton, who was working on a construction job 121 miles away at the time and has been cleared as a suspect, received a Snapchat from Mollie that night, which he opened at 10pm. It appeared to have been taken indoors but it is unclear when it was taken.

Concerns were raised after Mollie failed to turn up to work at a daycare center in a nearby town the following day. Jack returned to the house that day after realizing she was missing.

Her longtime boyfriend told Fox News on Wednesday that she had probably gone to bed without locking the doors given it's a rural town of about 1,400 people.

'It's Brooklyn. You don't lock your doors,' Dalton said. 'It's more than likely because you know, nobody ever thought there was a reason to. Again, it's Brooklyn. Nothing ever happens in Brooklyn. That's why it's such a blindsided situation.'

Authorities have previously said there were no signs of a struggle or a break-in at the home.

Dalton said early in the investigation he was calling his girlfriend's phone constantly in the hope that someone would pick up.

'I did for like the first week and a half. Not more recently. I was just trying to see literally if anybody would pick up. And then, yeah, straight to voicemail,' he said.

Dalton's brother said he was visiting his fiancee Aimee in Ames, about 80 miles away, on the night Mollie disappeared. Blake has slammed claims that Mollie's family had any involvement in her disappearance, saying: 'The people in this community know the truth'.

Mollie is pictured above on the left with her grandmother Judy Calderwood and her three brothers. Her family are pleading with the public to come forward with information

Mollie's mother Laura Calderwood (pictured) said giving up hope is 'not an option' in an interview with ABC News nine days after the 20-year-old's disappearance

Investigators revealed on Friday that they had searched a pig farm about 15 minutes from Jack's home after receiving a tip - but found no sign of Mollie.

After combing every field, barn and shed in the rural area for almost a week, local police called in for backup from the FBI on Tuesday.

Federal officials, who have interviewed more than 200 people, announced they were zeroing in on Mollie's internet footprint, keeping tabs on her social media accounts, and analyzing activity recorded by her Fitbit tracker.

'She never takes it off,' Dalton said of his girlfriend's Fitbit. 'She uses it for the sleep tracker and all her runs.'

Mitch Mortvedt, assistant director of the Iowa Division of Criminal Investigation, said officials are getting 'a lot of information' from her digital footprint.

'We are very hopeful with the electronic data we are getting back,' he added.

Mortvedt said officials have little to go on, but they're 'leaning more and more toward something happening to her against her will'.

Tibbett's mother Laura Calderwood said on Sunday she was doing her best to stay positive.

Mollie was due to attend the wedding of her boyfriend's brother Blake and fiancee Aimee Houghton (above) in the Dominican Republic this week. They have since canceled their wedding as the search continues

'If it were me that were missing, Mollie wouldn't give up hope - that's not even a thought,' she told ABC News. 'You won't see me giving up hope. That's not an option.'

Her father said someone out there knows something about his daughter's disappearance as he urged the public to come forward with information.

When asked if he had a message for his daughter, he said: 'Just come home, pie. We're looking, we'll find you'.

'She's a brave girl. She'll be fine, just hang in there.'

The father said investigators have told him 'again and again' that missing person cases similar to his daughter's have always been solved by a tip from the community.

'What we need is for people to tell their friends and neighbors that if they saw anything that seemed even remotely out of the ordinary to call authorities and they will run that down,' he said.

Anyone with information is urged to contact the police tip lines at (800) 452-1111 or (515) 223-1400. The sheriff said the public can also send tips via email to tips@poweshiekcosheriff.com