UPDATE: Emergency services have isolated the gas leak which has forced a school into lock down in Wilsonton.
Gas technicians have isolated the gas supply to homes on McDougall St after a passer-by reported the leak to emergency services about 11am today.
Queensland Fire and Emergency Services Kitchener St station officer Chris Martial said the leak is believed to have been caused by tree roots at a gas main about 100m from the Fairview Heights State School gates.
He said the initial exclusion zone of 100m x 100m was reduced after the gas leak location and cause was identified.
"As part of that process was we approached the school and got the school to enact their emergency lock down procedures and put the kids in what we call protect in place in the safety of the classrooms," Mr Martial said.
"Being natural gas we were able to reduce that exclusion zone to the lower end.
"It was a bit of a worry especially at the beginning and the close location to the school."
EARLIER: Emergency services have evacuated homes and a school is in lock down after reports of a gas leak.
Fairview Heights State School on McDougall St has enacted its emergency procedures after a gas leak shortly before 11am.
Queensland Fire and Emergency Services have evacuated nearby homes as gas technicians investigate the cause.
Fairview Heights State School has about 570 enrolled students, according to its website.
EARLIER: A Toowoomba school has been evacuated and an exclusion zone set up after a gas leak.
High gas levels have been recorded outside Fairview Heights State School on McDougall St, triggering an evacuation of the premises.
It is understood the gas leak is from a nearby business.
Queensland Fire and Emergency Services are investigating the cause but have called for the area to be evacuated until the gas leak is contained.
Police have been called to the premises, and an exclusion zone of 50m uphill and 100m downhill from the school established.