Some children who noticed the bears chased the mother and three cubs up a tree.
Soon, other people arrived to take a look and that made the situation even more dangerous.
Police escorted everyone out. They hope the bears will move into the forest on their own, saying it was too dangerous to tranquilize them under night conditions.

VIOLA PARK - PHOTOS: pic.twitter.com/OWKnEQeHSa
— First Responders (@FirstResponseRC) April 26, 2015
Bears are common to the area, but are not common in Viola Park.