Two Darien teens are facing multiple charges after admitting to hand-delivering letters containing a white powder to two town residences over Labor Day weekend.

On Monday, the two girls, both 17, turned themselves in to Darien Police after learning about warrants for their arrests.

Both teens were charged with two counts each of first-degree breach of peace, first-degree conspiracy to breach of peace, second-degree threatening and second-degree conspiracy to threatening.

The first letter was reported to police Sept. 2 and the second Sept. 3. Numerous law enforcement and other agencies responded to the incidents, including the Darien Police, Connecticut State Police, the FBI, the Stamford Police Bomb Squad, the state Department of Environmental Protection, the Darien Fire Marshal's Office, the Darien Fire Department and Darien EMS, a police statement said.

The teens told police the residences they targeted were chosen randomly and that they had no connection to them. The girls told police the powder was a "nontoxic food product."

Detectives are confident that this was a random act and the powder was identified as not being a health hazard, police said in a statement released Tuesday. The homes that were subject to the incident were not targeted in any way, the release stated.

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The two females, whose names are being withheld because they are minors, are expected to appear in Stamford Superior Court later this month, police stated in a release.