ALPHARETTA, Ga. - An Alpharetta law firm was evacuated Thursday morning after four people complained of unidentified symptoms, say authorities.

Alpharetta authorities say they are running a HAZMAT operation to determine the source of the complaints at the Promise Solutions Law Firm on old Alabama Road.

Authorities say the four people who complained of symptoms refused to be transported to a hospital.

Colorado Springs Police officers, Hazmat team members and Springs fire fighters responded to a house on Willamette Avenue in Colorado Springs.

Authorities said Friday evening a man who reportedly threatened to blow up his house was not inside when they went into the home.

Sources on the scene said natural gas was left on in the house.

Police blocked off a portion of Willamette going west-bound, but said it would likely re-open around 7 pm.

TORONTO — A Toronto grocery store evacuated after some staff and customers became ill Saturday should reopen Monday after being given the all clear, Loblaw said Sunday.

The food chain said four customers and seven employees were affected by symptoms that “include vomiting and to a lesser degree, diarrhea” but all were recovering.

While media reports said the illnesses were caused by a chemical leak, the chain said tests found no such evidence.

“Testing at the store by an environmental company and the Fire Department has since shown no environmental issues, such as a chemical leak exist at the store,” the chain said in a statement, adding “the store has been cleared by the local Fire Department and relevant authorities as being safe.”

Three recent chemical leaks at a West Virginia DuPont plant, one of which killed a worker, don't appear to be related, a federal investigator said. U.S. Chemical Safety Board investigator Johnnie Banks promised a thorough investigation into the leaks, which prompted the plant's temporary shutdown over the weekend. The release of about 1,900 pounds of methyl chloride went unnoticed for five days before the company reported it.