Search Continues for Virginia Woman Who Vanished After Calling in Sick to Firefighter Job
04/21/2016 AT 12:40 PM EDT
A spokesperson for the Virginia State Police tells PEOPLE that foul play is not suspected in Mittendorff's disappearance at this time. The spokesperson also confirms Mittendorff downloaded unspecified documentation onto her cell phone shortly before vanishing, but refused to discuss their contents.
Police claim Mittendorff, who worked for the Fairfax County Fired Department, was last heard from on April 13, when she called in sick from work before texting her father.
Her 2009 Mini Cooper was recovered Saturday from Shenandoah National Park, where relatives say she'd regularly run.
Since the weekend, Virginia State Police have fielded over 100 tips about Mittendorff's possible whereabouts, the spokesperson says. Her cellular provider has also agreed to cooperate with investigators who're eager to pinpoint the missing woman's last known movements.
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Mittendorff's coworkers at the firehouse have asked the public to come forward with any information that may lead to her safe return. Family and friends gathered Wednesday night for a vigil.
During a press conference on Tuesday, Nicole's husband Steve Mittendorff read a statement, asking that his wife make contact.
"Sweetheart, I love you," he said. "I am praying for you. I'm not sure where you are but know that we are all looking for you. And I look forward to your safe return."
The police spokesperson tells PEOPLE that search efforts by land and air concluded at sundown on Wednesday and would resume Thursday morning with canine units.