Volunteer canvassing efforts to locate Jassen Strokosch have so far been unsuccessful, authorities and sources close to the family said.

"There's nothing new," said Laurent Pernot, Strokosch's colleague. "People canvassed yesterday and we're hopeful that will generate a good lead."

Pernot credited the efforts of the Oak Park Police Department, saying they've "been on this with dedicated personnel and coordinating with agencies at every level." Police in Oak Park said they've reached out to regional law enforcement agencies, including the Chicago Police Department and many west suburban departments, to be on the lookout for Strokosch.

Meanwhile, questions continue to swirl about the disappearance. Authorities and media accounts indicate Strokosch, a married father of two and prominent Oak Parker, was seen leaving his home in the 1100 block of South East Avenue around 8 a.m. Tuesday.(via Oak Leaves) According to police in Oak Park, Strokosch was spotted near the intersection of Cermak Road and Des Plaines in Forest Park around 10 a.m. Wednesday, dressed in street clothes described as "a plaid button up shirt, unknown t-shirt underneath, and either blue jeans or khakis."

Pressed on specifics about the spotting, police officials declined comment.

On Thursday, friends aiding the canvassing effort said more than 100 volunteers braved the extreme heat, posting informational fliers out to passersby throughout the area and commuters heading to and from CTA train stops.

Other organized efforts have included a search of Thatcher Woods in River Forest late Thursday afternoon. According to an early morning post on the The Buzz Cafe's Facebook page, another search of Thatcher Woods was already underway early Friday morning. It's unclear if the effort was hampered by the hazardous weather conditions that have arrived in the area around 9:45 a.m.