There were some tense moments in Waikiki Monday after a fire broke out on one of the upper floors of a high-rise condominium.

Honolulu fire crews responded to the two-alarm fire at 300 Wai Nani Way at around 12:15 p.m.

The fire broke out on the 18th floor of the King Tower at Liliuokalani Gardens.  A witness said there were seven fire trucks at the scene.

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Fire officials said everyone in the building evacuated.  The occupant of the unit where the fire started was not at home at the time of the blaze.

Residents knew something was wrong even before the fire alarm sounded throughout the 25-story building.

"I thought I had something burning on the stove, actually," said Blake Smith.  "Looked around.  I didn't have anything.  And then saw smoke coming out of the window from upstairs."

"Came downstairs and looked up and, yup, there was a fire coming from the 18th floor," said Laura Santos.

Since the mid-1970s, all high-rise  building on Oahu above 75-feet-tall were required to have a sprinkler system.  Liliuokalani Gardens was built in 1984 and had its sprinklers built in.

"The fire was controlled by a sprinkler head in the room where it began," said Honolulu Fire Department Capt. Terry Seelig.  "It appears that it began in the living room."