Robert and Charlene Spierer at Friday's news conference. (WIBC.com photo: Liz Thomas)

Two weeks after the disappearance of his daughter, Robert Spierer choked back tears while thinking about spending Father's Day without her.

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The father of missing Indiana University student Lauren Spierer, 20, Friday asked other families to express their love for each other.

"We all know that this Sunday is Father's Day," Robert Spierer said. "I would ask any of the children out there to let your parents know how much you love them. You parents out there, make sure you let your children know how much you love them."

Charlene Spierer spoke up for her husband as he attempted to regain his composure.

"The greatest gift Robbie could have (on Father's Day) would be information about Lauren."

Bloomington Police released no significant developments during the week's last daily news conference, saying search efforts for Spierer would continue throughout the weekend.

Capt. Joe Qualters noted the department had received more than 1,000 tips in the two weeks since Spierer went missing, including 500 tips about a white truck caught on surveillance video near the last place Spierer was reportedly seen.

"The bottom line is, at this point, we still have a missing person," Qualters said. "Our efforts to find Lauren will not stop."

Over the weekend, volunteers will work to re-poster the Bloomington area with Spierer's picture and information about her disappearance. "America's Most Wanted" will also feature Spierer's case on its show Saturday.