No injuries in fire at John Hancock Center

CHICAGO (WLS) -- Investigators are trying to find out what triggered a fire in the John Hancock building.

Firefighters were called just before 10 p.m. Thursday. Flames broke out on the 87th floor of the Magnificent Mile high-rise.

The fire was contained to one condo and extinguished within an hour. There was some smoke damage, but no one was hurt.

The building was not evacuated, but some people left on their own.