Four people were hospitalized after high levels of carbon monoxide were detected in the Elements Horsham strip mall, according to reports.
According to CBS 3, the victims were taken to Abington Memorial Hospital Tuesday evening.
Nine people reported being sickened by the fumes, which occurred at the strip mall on the 300 block of Horsham Road. The shopping center is anchored by Starbucks.
Horsham Fire Chief Tim Flanagan told the Intelligencer that several Starbucks patrons reported dizziness, headaches and other indicators of carbon monoxide poisoning.
The building was evacuated and completely ventilated. Some stores reopened later that night, according to CBS 3.