BALTIMORE (AP) — A Baltimore public works spokesman says a chlorine leak at a water treatment plant has sent two employees to area hospitals.

Spokesman Kurt Kocher says the leak occurred Monday morning at the Montebello treatment plant on Hillen Road. One employee was taken to Johns Hopkins and the other to Union Memorial. Kocher says the conditions of the employees were not immediately known.

The spokesman says between 15 and 20 employees were in the plant at the time and were evacuated. He says the leak was capped by firefighters and no one outside the plant was affected.

Kocher says an investigation is under way, but initial reports indicate a cap on a cylinder of chlorine gas may have failed.