3 charged in southside Indianapolis fatal blast

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Police say the three people responsible for the deadly southside explosion had tried unsuccessfully to blow up the home a week earlier.

The Marion County Prosecutor’s Office charged Monserrate Shirley, 47, Mark Leonard, 43, and Bob Leonard, 54, with two counts of murder, conspiracy to ­commit arson, 12 counts of Class A felony arson and 33 counts of Class B felony arson each.

Investigators believe they removed a natural gas valve on the fireplace, let gas build up in the home for six to nine hours and ignited it with a spark from a microwave that could be set on a timer, Marion County Prosecutor Terry Curry said.

Shirley and Mark Leonard lived in the home on Fieldfare Way that exploded but weren’t home at the time.

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