INDIANAPOLIS - The investigators of the deadly south side explosion are focusing on searching for a fourth suspect and testing evidence collected from the scene of the blast.
Police said a microwave and the tampering of fireplace equipment triggered the south side explosion, but investigators are still waiting for results from a lab in Washington, D.C.
Without the detailed report soon, it's likely a March 4 trial date for the three suspects could be delayed.
Special Section: Indy Explosion
There is plenty of evidence still being processed from the crime scene. It could be weeks or months before investigators get the results.
Indianapolis Department of Homeland Security Chief Gary Coons said the city has not imposed any deadlines on getting the information needed to wrap up their investigation.
"We're not pushing the ATF to give us any kind of results, or our crime lab," Coons said. "As far as the full testing, we want it done right… They're doing it as they're supposed to, following all the rules, all the laws."
Coons said investigators are still taking tips on the unknown fourth suspect -- the second person that was apparently in the white van with Robert Leonard on the night of the deadly explosion.
"It's not like the fourth person would know who called in on them or who gave us information," Coons said. "People can remain anonymous, as far as giving us tips."
The three currently in custody face murder and arson charges.
Monserrate Shirley, her boyfriend Mark Ray Leonard, and his brother Robert stand accused of being involved in blowing up the house in the Richmond Hill subdivision in hopes of collecting on a $300,000 insurance policy.
No decision has been made yet on whether the three suspects will face capital punishment.
Beyond the ATF, the U.S. Secret Service is also on the job assisting city investigators.
Coons could not comment on specifics of the evidence collected or anything to do with the pending trial.
There are still two rewards available for information leading to a conviction. Crime Stoppers is offering up to $1,000, and the ATF is offering up to $10,000.