Hackers broke into a water treatment facility that serves the town of Oldsmar in Florida on Friday and attempted to poison the water supply, the Pinellas County Sheriff said on Monday.

The amount of sodium hydroxide, also known as lye, was momentarily increased from 100 parts per million to 11,100 parts per million. 'In these mega quantities, it's a caustic substance,' said Sheriff Bob Gualtieri.

The hackers remotely gained access to a software program, named TeamViewer, on the computer of an employee at the facility to gain control of other systems. Supervisors routinely 'remote in' to the computers, so the employee was not initially worried.

'The guy was sitting there monitoring the computer as he's supposed to and all of a sudden he sees a window pop up that the computer has been accessed,' Gualtieri said. 'The next thing you know someone is dragging the mouse and clicking around and opening programs and manipulating the system.'

The hackers then increased the amount of the chemical being distributed into the water supply. The chemical is typically used in small amounts to control the acidity of water, but at higher levels is dangerous to consume.

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