The FDNY was on the scene of a HAZMAT condition at the 9/11 Memorial in Lower Manhattan, Breaking911.com reported.

Sources tell Breaking911.com that an algaecide was reportedly added to the water in the reflecting south pool outside the 9/11 Museum. It was added on Saturday by park maintenance. The chemical is causing people nearby to cough and gag on the fumes.

The water in it will be vacuumed out and filtered. The pool will reopen on Monday morning at 6:00AM, The plaza itself remains open, the only area that will remain closed is the east side of the South Reflecting Pool.

Too much #chlorine #wtc memorial pools. Area evacuated. Police say people reporting coughing. #news pic.twitter.com/7guE4tpnRt

— Michael Caldwell MD (@healthchief) May 17, 2015

#wtc #memorial #evacuated 2 much #chlorine pool H2O #news #nyc #health #police report people #coughing pic.twitter.com/h3inGZ8esv

— Michael Caldwell MD (@healthchief) May 17, 2015

we got evacuated from the 9/11 memorial because apparently there was too much chlorine added to the north and south pools

— Andrea Stanic (@stanican) May 17, 2015