Two Suffolk County schools were evacuated Friday morning in separate instances of gas leaks, authorities said.

Students walked out of Deer Park High School shortly before 10 a.m. because someone smelled gas coming from a classroom, said Eva Demyen, superintendent of the Deer Park school district.

National Grid crews and firefighters determined the leak was coming from a gas burner in a science lab, Demyen said.

"Students were evacuated as a precautionary measure and then moved to buses to remain warm before returning to the building approximately an hour and a half later," the superintendent wrote in an email.

No one reported being ill, Demyen said, and the cause of the gas burner leak has not been determined.

Later, elementary students hustled out of a Wyandanch school due to a stove left on in the kitchen school, a National Grid spokeswoman said.

A 911 call came in at 10:17 a.m. reporting an odor of gas at the LaFrancis Hardiman Elementary School on Mount Avenue, Suffolk County police said. Firefighters from the Wyandanch Fire Department also responded to the scene. School officials did not immediately return a call seeking comment.

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An investigation by a National Grid response crew also found one stove had been left on and another stove "weeping" -- or leaking gas -- slightly, a utility spokeswoman said.

Both items were tagged, she said, meaning the stoves cannot be used again until they undergo a safety inspection.

There were no reported injuries.

A National Grid spokeswoman said students returned to the school.