RESIDENTS were ordered to stay indoors and keep their windows firmly shut for the second time in a month as the Ineos Chlor plant suffered another chlorine leak.
Warning sirens sounded at 4.45pm on Monday and fire officers rushed to the scene when a leak was detected in the chlorine pipeline.
The leak, described by the firm as 'minor', came just four weeks after the emergency Operation Cloudburst was launched to tackle a leak.
Six weeks ago the chemical giant claimed it needs £635m from the Government to improve out-of-date equipment including the cellrooms used to manufacture chlorine.
On Monday residents in Weston Village and Weston Point were ordered to keep houses shut.
They were warned the gas could cause breathing problems and skin and eye irritation. Doctors were put on the alert, but there were no casualties.
Motorists driving through the area were warned to switch off car ventilation systems and keep their windows wound up.
One resident told the Weekly News: 'It was a surprise to hear the sirens again so soon after the last incident. We just hope that this sort of thing isn't going to turn into a regular occurrence.'
Spencer Webster, Halton Borough Council's head of risk and emergency planning, said: 'As soon as we were alerted to the incident at Ineos Chlor, we placed our emergency team on standby and closely monitored the situation.
'We will now be co-ordinating a multi-agency debrief.'