Story highlights More than 100 people overdosed on synthetic marijuana in one weekend

EMS service says the overdoses are overwhelming their resources

(CNN) One hundred and two people in Lancaster County, Pennsylvania, overdosed on synthetic marijuana in three days, according to C. Robert May, director of Lancaster Emergency Medical Services. None of the overdoses were fatal.

"Heroin is normally the issue but in the last week there's been an overdose of synthetic marijuana," also known as K2, May told CNN. "The assumption is that heroin is not readily available, so people are turning to K2."

The treatment of the overdose patients took place between the morning of July 7 through the morning of July 10. More overdoses followed -- by the following Friday, July 14, a total of 158 overdose patients were involved in emergency response calls.

According to May, some calls involve two to four patients at once, with a few patients repeating in a span of a few hours.

"This past weekend we responded to one patient nine times in 24 hours," May said.

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