Several injured in suspected gas leak explosion in Youngstown, Ohio

At least seven people were injured in what appears to be a gas leak explosion on Tuesday afternoon, with at least one person injured critically, and two other people missing, officials said.

The explosion appeared to wipe out the bottom story of a 13-story building, which included a Chase bank and apartments, according to NBC News. Youngstown Fire Chief Barry Finley said crews are still determining the cause of the explosion, including investigating whether there was a gas leak as first believed. But so far there is no evidence of suspicious activity.

"All I know for sure is that there was an explosion," Finley told reporters during a press briefing Tuesday evening, per ABC News.

A spokesperson for Enbridge Gas Ohio also said the cause has not been identified, and an investigation into the explosion is being conducted. Authorities have shut down the entire block for safety, and the neighboring building has also been evacuated as a precaution, according to WKYC.

"I’d like to extend our sincere condolences to those impacted by this event, to their families and to the community. Our primary concern is the safety and well-being of everyone involved," the company said. "The cause is not known at this time. An investigation will be led by the State Fire Marshal’s office, and we will assist in any way we can. This process can take time. Our thoughts are with those who have been impacted by this event."

The seven injured have been taken to Mercy Health Hospital. The names and injuries of those wounded have not been released so far, because families are still being notified. 

"Our hearts go out to those impacted, and we stand ready to assist those in need as the health of our patients and the entire Youngstown community is and always has been our top priority," Mercy Health Hospital spokeswoman Jennifer Robinson said in a statement.