SACO — Two out-of-state men were arrested Thursday by state police after an investigation into two packages of marijuana totaling 28 pounds that were mailed from California to Maine.

Kimsour Lim, 36, of Long Beach, Calif., and Chamroeun Mao, 32, of Lowell, Mass., have both been charged with felony trafficking in marijuana. They were held Thursday at York County Jail on $50,000 bail and were scheduled to make their first court appearances Friday in York County Superior Court.

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The investigation by Saco Police, Maine State Police, Maine Drug Enforcment and U.S. postal inspectors began earlier this week.

A resident of Smutty Lane in Saco noticed that a package had been delivered to a vacant home. Assuming it was suspicious, the resident opened the package, discovered marijuana and called police. The next day, postal inspectors in Portland intercepted a similar package.

The two shipments had a combined street value of $85,000, according to Saco Deputy Police Chief Jeffrey Holland. The drugs ultimately were bound for Massachusetts, he said.

The two packages led police to Lim and Mao, who were arrested during a traffic stop on interstate 95 southbound on Thursday.

Holland said this is the first time his department has investigated a case that involved drugs trafficking by mail.