Nassau County emergency services units and members of an FBI...

Nassau County emergency services units and members of an FBI hazmat team investigate suspicious mail delivered to the office of Nassau County District Attorney Kathleen Rice in Mineola on Feb. 10, 2014. Credit: Howard Schnapp

Police are investigating "a suspicious piece of mail" received Monday by Nassau County District Attorney Kathleen Rice.

District attorney spokesman Paul Leonard acknowledged receipt of the mail and said "police are investigating the situation, and the office remains open."

Further details were not immediately available.

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State AG probing NUMC over former leaders' spending ... Knicks vs. Spurs finally! ... Car insurance rates could drop? ... New play place in Deer Park ... Get the latest news and more great videos at NewsdayTV

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