The whereabouts of San Francisco teacher Edward Cavanaugh, a Long Island native, remained unknown Friday -- two weeks after authorities said he went missing in the El Dorado National Forest.

The 45-year-old Cavanaugh, reportedly a former Ronkonkoma resident who moved to California more than 20 years ago, was last seen on his blue Yamaha YZ250 motorcycle in the Rock Creek trail system on July 17, according to the El Dorado County Sheriff's Office.

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Search and rescue teams, including searchers from the California National Guard, have been looking for Cavanaugh since July 24.

VideoFormer Ronkonkoma resident missing in California

Authorities have used a drone, search aircraft and ground crews, including high-angle rope teams, mounted horseback teams, motorized crews in four-wheel-drive vehicles and on motorcycles, as well as search dogs, but have not found any sign of the missing man.

Sheriff's office detectives said foul play is not suspected.

"We're not grieving for anybody," a longtime friend of Cavanaugh, Matt Hartford, said in a statement released by the Sheriff's Office on Thursday. "We're still expecting to find him and for him to be mad at us for how long it took us to find him. We're calling this the biggest game of hide-and-go-seek and he's won."

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Cavanaugh's family is raising money to gather volunteers to assist in the search, according to News 12 Long Island. As of Friday night, about $60,000 had been donated, News 12 said.