The United States and Canada will continue to prohibit the importation of goods from other countries under new travel restrictions on the Pacific islands of Oahu and Maui.
The new restrictions were imposed after a major explosion at a Honolulu hotel last month left dozens dead.
Hawaii Governor David Ige signed the new restrictions into law Friday.
The legislation was prompted by the deaths of more than 300 people and the release of a video showing a man allegedly driving a car with a deadly cargo of fentanyl, which was allegedly being transported into the United States.
The federal government said the new travel ban applies to any goods imported from China, which is not covered under the previous travel restrictions.
Ige said the restrictions will be effective from May 20.
He also said that the new measures would prevent individuals and companies from sending supplies to Hawaii and other parts of the Pacific, and prevent individuals from bringing in people from countries that are involved in the conflict in Syria.
The move comes as the U.S. and Canada prepare to take the next step in their long-running battle against fentanyl, a powerful painkiller that can be used to treat opioid addiction and other illnesses.
The drug was recently linked to at least 40 deaths in Canada, including a man in Vancouver who died of a fentanyl overdose.
Canada has also taken steps to curb the flow of fentanyl into the country.
Under the new legislation, a person or company will have to obtain a prescription from a doctor or a licensed health care provider to import any non-medically approved product containing fentanyl.
It is not illegal to import the drug, but the federal government will impose a $1,000 surcharge on any shipments over $5,000.
The law also requires a government-issued identification to bring in anyone who is not a Canadian citizen.
The bill will take effect in July.
Igge said Friday the legislation was intended to be a temporary measure and said he would continue to monitor the situation closely.