Residents said two large brown bears, which experts said may have been a mother and a cub, were spotted wandering the suburb northeast of Los Angeles and are believed to have been behind a few knocked-over trash cans, KTLA-TV, Los Angeles, reported Monday.
A large mountain lion was seen in the area a short time after the bear sightings, locals said.
Authorities said all three of the animals returned to the wilderness a short time after being spotted.
Monrovia is in the foothills of the San Gabriel Mountains.
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