Sen. Chris Murphy is pushing for more action to be taken to stop the flow of fentanyl from Mexico amid a spike in overdoses in the U.S.

Fentanyl caused a quarter of all overdoses in Connecticut in 2015. That number tripled last year, leading to a staggering 1,500 deaths. 

"From just Hartford alone, we've seen a 471% increase in fentanyl seizures in the last two years,” says Chief Jason Thundy, of the Hartford Police Department. 

Susan Logan, of the Connecticut Department of Health, adds, "It's getting into cocaine. It's in heroin. We're seeing it in crack cocaine. We're seeing it mixed with Xylazine, which is a veterinary tranquilizer.”

Customs and Border Protection says almost all fentanyl comes in cars through legal ports of entry.

Murphy, who just returned from a trip to Mexico and Colombia, is urging the Border Patrol to invest in more technology to catch drug traffickers at the border.

“The problem is, we're not catching it. So, we have put $700 million into new technology -- cutting-edge technology -- across the border to catch fentanyl when it comes in,” he says.

Health departments in Connecticut are getting more life-saving naloxone out to help combat the overdose surge.

"It's pretty much implied, if you're getting something on the street, it's likely going to have fentanyl,” says Liany Arroyo, the director of Hartford Health. 

Wednesday is International Overdose Awareness Day.