Birthday of missing Ind. student Lauren Spierer spurs push for information

A missing poster for Lauren Spierer

(CBS/WISH) INDIANAPOLIS - The family of Indiana University student Lauren Spierer, who has been missing since last June, released a statement Tuesday in honor of her 21st birthday.

Pictures: Lauren Spierer

The missing woman's birthday has spurred supporters to continue pushing for information on her whereabouts.

The Herald Times reports Spierer's parents, Robert and Charlene, and her older sister, Rebecca, posted on the website Tuesday morning:

"January 17th....

Remembering today, 21 years ago, as one of the happiest days in our lives. Happy Birthday, Lauren.

We love you with all our hearts,

Mom, Dad and Rebecca"

Spierer was last seen about 4:30 a.m. on June 3, 2011 at a downtown intersection after a night of partying with friends. A friend she was with that night told police Spierer walked home alone after being at a sports bar and a few downtown apartments.

There have been no clues as to what happened to her. Police and volunteer search efforts - including a search of 4100 tons of trash in a landfill - dug up no new information over the summer.

CBS affiliate WISH reports that the primary Twitter account used to spread information about Spierer's disappearance and recover efforts posted about her birthday Tuesday morning and accused those who haven't come forward.

Friends and supporters tried getting Spierer's name and birthday trending on Twitter.

"She's 21 today & should be celebrating w/her friends @IndianaUniv. Even though u weren't directly involved, u've known & remained silent," one Tweet said.

Bloomington Police Department officials say they still get several tips each week, but none have resulted in anything concrete. Detectives remain in regular contact with Spierer's parents.

Complete Coverage of Lauren Spierer on Crimesider