事故が起こった

an accident happened

→ 事故
phrase Uncommon #15,673
an accident happened 事故 means “accident,” and 起こった is the past form of 起こる, meaning “happened” or “occurred.”
JA: 昨日、駅の近くで事故が起こった。
EN: An accident happened near the station yesterday.

彼の留守中に恐ろしい事故が起こった

A terrible accident happened while he was away.

昨夜花火工場で爆発事故が起こった

Last night, an explosion occurred at a fireworks factory.

彼の不注意の結果その事故が起こった

The accident happened as a result of his carelessness.

事故が起こったところである

This is where the accident happened.

どうして事故が起こったのですか

Why did the accident happen?

そんなふうにして事故が起こったのです

That’s how the accident happened.

事故が起こった彼らにはどうしようもなかった

An accident happened, but there was nothing they could do.