Norristown, PA – Authorities in southeastern Pennsylvania said a carbon monoxide leak sent eight people to a hospital, two of them in critical condition.

Emergency crews in Montgomery County were dispatched to a Norristown row house just after 11 p.m. Saturday.

Officials said elevated levels of carbon monoxide were found in five homes, and the source was a generator running in the basement of one of the homes.

Thomas O’Donnell, the Norristown fire chief, said power to the home had been shut off by a utility company on Thursday due to nonpayment. He said the resident then bought a generator and was using it to power the home.

Officials said another resident had a working carbon monoxide detector that went off.

Officials said those hospitalized include a paramedic.