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GREENWOOD, Ind. -- A vigil has been held for a suburban Indianapolis teacher whose home was destroyed in an explosion that ripped through her neighborhood.

Two people were killed in the explosion Saturday night. Officials have not released their names. However, a candlelight vigil was held at Greenwood's Southwest Elementary School on Sunday night for second-grade teacher Jennifer Longworth.

She and her husband, John Dion Longworth, lived at a home destroyed in the blast. WTHR-TV reports that friends, family and colleagues of Jennifer Longworth gathered at the school.

Superintendent David Edds says the Greenwood schools will open two hours late Monday so staff can prepare for how they will talk to students about what happened.

Officials say as many as 31 homes were damaged so badly that they may have to be demolished.

Deputy Code Enforcement Director Adam Collins estimated the damage at $3.6 million.

Deputy Fire Chief Kenny Bacon told reporters Sunday investigators haven't ruled out any possible causes of the late-night blast that was heard miles away.

But a congressman who represents the Indianapolis neighborhood says investigators have ruled out a bomb or a meth lab.

U.S. Rep. Andre Carson said he had received that report from Homeland Security officials during a tour of the devastated middle-class subdivision.

Residents described a loud boom that shook their homes, blew out windows and collapsed ceilings.