(Fixes typo in first paragraph)

JAKARTA, Jan 15 (Reuters) - The second floor of the Indonesia Stock Exchange building collapsed on Monday, said an exchange employee, injuring around a dozen people who were carried on stretchers from the building.

"The second floor of the building has collapsed," said Vindy, a personal assistant to the exchange's President Director Tito Sulistio, who was in the building at the time.

Around a dozen injured people were seen being carried from the building on stretchers, a Reuters witness said and police were cordoning off the two-tower, multi-storey building. (Reporting by Cindy Silviana; EDiting by Michael Perry)