Five days into the search for fugitive ex-cop Christopher Jordan Dorner, authorities hope a $1-million reward that will be announced Sunday could jump-start the case.

The frustrating search has spanned from Riverside to Corona to Big Bear to Point Loma in San Diego. There have been numerous false starts, but officials say the heightened publicity has not brought them closer to making an arrest.

Officials said Sunday the search in Big Bear was winding down.

On Sunday morning, authorities received a tip that Dorner may have been spotted down the mountain in San Bernardino, forcing the evacuation of an apartment complex, but it turned out to be a false alarm.

More: Dorner Manhunt: $1-Million Reward Could Jump-Start Five-Day Search