The search pressed on Thursday for an 85-year-old Scripps Ranch man missing for a week.
Hundreds of volunteers have been looking for Taiheng Sun since he was last seen on June 15. The man speaks little English and has Alzheimer's disease. His family says he's been taking medication for depression.
Many volunteers feel compelled to keep looking for Sun.
"You can sit on your sofa and you can detach yourself from the world, or you can actually step out the door and be part of it," said volunteer Arvind Knudsen.
Citizen search efforts continued Thursday with one team gathered at the sheriff's command post in the West Sycamore entrance to Mission Trails.
"We just talked to them, told them the latest information, asked if they had any cameras that were facing toward the streets," Knudsen said, explaining the efforts of volunteers who went door-to-door in the area.
The Scripps Ranch Civic Association also searched at the corner of Legacy Road and Legacy Canyon Place.
"He had his ID in his pocket," said Chris Sen, the son of the missing man. "We even made a necklace with all his information. If anyone finds an older gentleman that's disabled, please search his pockets."
Police are looking for any new clues that may help solve Sun's disappearance.
Sun left his home in Rancho Encantada and headed east on Stonebridge Parkway and Via Santa Pradera.
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"I was getting concerned. It's been so hot, but when I heard they'd seen [him] on Saturday, I thought maybe someone stopped to help him and maybe he's figured out a way to get water and food," said volunteer Jenny Lopez.
Police saw a person on surveillance video that looked similar to Sun, but has since determined the individual was not Sun.
"Online there's certainly been a lot of speculation, a lot of calls for volunteers, a lot of people hoping that there's still going to be a positive resolution to this really unfortunate situation," said Amanda Murphy, a neighbor who lives in the area.
"I just feel for the family, and I have to feel like I've done my part to help find him," Lopez told NBC 7.
The Scripps Ranch Civic Association (SRCA) formed a Community Search Committee to help find the missing man. Volunteers headed to the SRCA Community Center last weekend.
Sun was last seen wearing a dark-colored baseball cap, a white fleece windbreaker, and dark-colored pants. Police said he does not drive and has no means of transportation.
