The city of Boulder has issued temporary leash restrictions near the National Center for Atmospheric Research after a visitor and her off-leash dog encountered a bear on a nearby trail Monday.

The restrictions will apply to a section of the Mesa Trail between Bear and Skunk canyons and along the Mallory Cave and NCAR access trails, according to a city news release. The city will evaluate the temporary restrictions daily and will left them when appropriate.

Some areas along the trails are part of the city's green tag program, but even licensed dogs will still need to be on a leash in those areas while the leash restriction is in place.

The city also has separate seasonal leash restrictions in place along Skunk Canyon trail and other locations that will be lifted on Nov. 1.

At about 12:30 p.m. Monday, Boulder rangers received a report of an "aggressive" bear chasing a dog on the Mesa Trail near Mallory Cave.

Colorado Parks and Wildlife spokeswoman Jennifer Churchill said Monday that a woman on the trail reported her dog -- which was not on a leash -- started chasing the bear and that the bear then began chasing the dog. The woman said the bear eventually gave up.

Rangers searched the area, but did not find the bear. Because it was an animal interaction, Churchill said no action would have been taken against the bear.

Anyone who sees a bear is asked to call 303-441-3440 or 911 if it is an emergency.

Contact Camera Staff Writer Mitchell Byars at 303-473-1329, or