A massive construction drill fell over in Philadelphia on Tuesday evening and killed a man, police said.

Fire and police responded shortly after 9:10 p.m. at Block 3100 on Convention Avenue near Franklin Field and the Penn Museum in University City and found the man trapped under the oil rig, CBS Philadelphia reports. How long the 55-year-old had been there was not known.

According to The Philadelphia Inquirer, he was still breathing but was passed out and was bleeding profusely when he was rescued. He was transported by medics to Penn Presbyterian Medical Center, where he was pronounced dead at 9:45 p.m., Chief Inspector Scott Small said.

The rig operator was not seriously injured but may have been rushed to hospital for investigation, Small said.

“Lift heavy equipment off a semi-trailer truck and bring it to the job site. The crane turned around and we were called,” said Chuck Walker, assistant fire chief of Philadelphia.

The rig was owned by Cook Drilling Corp. made of Trevose. The company’s website shows a similar-looking drill rig weighing 75 tons.

A company representative could not be reached for comment.

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Police were investigating the accident and the labor protection agency should also investigate, Small said.