Everett police said Monday they will file no charges and are dropping the investigation of four Boeing employees fired last month for alleged drug violations at the company’s jet-assembly plant.

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Everett police said Monday they are dropping the investigation of four Boeing employees fired last month for alleged drug violations at the company’s assembly plant and will file no charges.

“Detectives reviewed the information provided by Boeing” but found “no probable cause or physical evidence exists to enable any further criminal investigation at this time,” police spokesman Aaron Snell said in a statement.

In an internal message after the firings, Boeing told its employees the terminations “followed a thorough investigation.”

That investigation had turned up “both drug sales and drug use” at the Everett plant, according to Boeing spokesman Doug Alder.

A company statement at the time said management would interrupt work in some areas of the Everett facility to conduct briefings that would both reiterate Boeing’s drug-free workplace policy and inform employees of the resources available to help anyone with a substance-abuse problem.

Alder on Monday said “Boeing will have no further comment and (we) are not providing any additional information.”

Bryan Corliss, a spokesman for the International Association of Machinists (IAM), said the union had no comment on the matter because “we are conducting our own review.”