Camden had 14 fentanyl-related overdoses in a four-hour span Wednesday, prompting warnings from law-enforcement officials about the deadly drug.

Camden County Police Chief Scott Thomson said the overdoses occurred in South Camden from 10 a.m. to 2 p.m.

"An arrest was made in the area of the overdoses, and they have come to an end," Thomson said in a statement.

"We will continue to monitor the area and ensure resources are directed to intercept and intervene against the poison being peddled on our streets," Thomson said.

N.J. Attorney General Christopher Porrino tweeted a warning about the overdoses and said they were caused by fentanyl-laced heroin.

Cooper University Hospital received at least a dozen overdose cases in just a few hours Wednesday afternoon, spokeswoman Wendy Marano said. There were no fatalities, she said.

Fentanyl is a pain medication often used in anesthesia that can be up to 50 times more powerful than heroin.