Federal investigators are looking into the April 17 home explosion in Firestone, which local fire officials say was caused by a build-up of raw natural gas leaking from an old, supposedly abandoned pipeline that was still attached to an old well about 178 feet from the home.

The investigators are reviewing the incident to see if what happened in Firestone might have national implications, said Keith Holloway, a spokesman for the National Transportation Safety Board (NTSB).

Also Wednesday, a spokeswoman for Firestone said the city, as a party to the NTSB’s investigation, will direct all questions regarding the accident to the NTSB.

Two men were killed in the explosion. State officials have ordered energy companies to inspect pipelines attached to every single oil and gas well in Colorado. The state has more than 54,000 active oil and gas wells.

Read more at Denver Business Journal.