1 killed, 7 injured after explosion at Chase bank in Youngstown, Ohio | LIVE

One idiosyncratic has died and 7 radical were injured, including 1 critically, aft an detonation rocked downtown Youngstown, Ohio, Tuesday, officials said.

The detonation occurred adjacent Central Square Tuesday afternoon, constabulary said.

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It is unclear what caused the explosion, which impacted a gathering that contains a Chase slope and apartments, authorities said.

Youngstown Fire Chief Barry Finley had initially characterized the incidental arsenic a earthy state explosion, but aboriginal said crews were moving to find if determination was a state leak.

"All I cognize for definite is that determination was an explosion," Finley told reporters during a property briefing Tuesday evening.

Mercy Health said Tuesday evening it is treating 7 radical who were injured successful the incident, including 1 idiosyncratic successful captious condition.

The antheral assemblage of a antheral who was an worker of the slope was pulled from the tract aboriginal Wednesday morning, the occurrence main said. Police were searching for his conveyance successful the aftermath of the explosion, helium said.

The level collapsed into the basement, which was flooded, and hunt crews were moving to nonstop a mini-drone successful determination to assistance successful the hunt effort, Finley said.

The Chase slope is located connected the crushed level of the building, with flat units connected the 12 floors above.

The gathering has been evacuated and streets successful the surrounding country person been closed to postulation indefinitely owed to the imaginable for a structural collapse, authorities said.

A Chase spokesperson told ABC News the institution is successful "close interaction with section officials to cheque connected the information of everyone successful the gathering and area."

"After that, we'll enactment to find what happened and to measure the damage," the spokesperson said.

There is nary grounds of immoderate suspicious enactment astatine this time, officials said.