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OMAHA, Neb. (AP) — Authorities say three people were injured when an explosion heavily damaged a home in southeast Omaha.

The blast heard for several blocks was reported around 5:30 p.m. Sunday. Battalion Chief Keith Main says the house foundation was bowed out by the blast, and says firefighters had to work around a lot of debris.

It’s unclear what caused the explosion. Metropolitan Utilities District spokeswoman Tracey Christensen says natural gas does not appear to be a cause.

Officials say Daniel Andersen was taken to Nebraska Medical Center, where he was listed Monday in critical condition. His brother David Andersen and another person also were injured.