PHOENIX (AP) — The Latest on a record fentanyl seizure at the U.S.-Mexico border in Arizona (all times local):

11:30 a.m.

U.S. Customs and Border Protection officials say they have made their biggest fentanyl bust ever, capturing nearly 254 pounds (114 kilograms) of the deadly synthetic opioid in Arizona.

The Nogales CBP Port Director Michael Humphries said Thursday that the drug was seized Saturday from a tractor-trailer carrying produce from Mexico after it was stopped for inspection at the border crossing.

Agents also seized an additional 2.2 pounds (1 kilogram) of fentanyl pills and a large cache of methamphetamine.

The Mexican man driving the truck was arrested.

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9:15 a.m.

U.S. Customs and Border Protection officials in Arizona say they’ve made their biggest fentanyl bust ever.

The agency says it will provide details Thursday during a late morning news conference at the Mariposa border crossing in Nogales, Arizona.

Authorities say illicit fentanyl in recent years has become the biggest source of fatal overdoses in the United States.

Mexican traffickers are increasingly smuggling the drug into the United States, mostly hidden in northbound passenger vehicles crossing at ports of entry in the Nogales and San Diego areas.

Law enforcement says the illicit version of the painkiller is now seen mostly as a white powder that can mixed with heroin for an extra kick and as blue pills that are counterfeits of prescription drugs like oxycodone.