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.

The law would require businesses to have proper state licensing, prove that their employees are paid and ban staff from living at the spas or sleeping there overnight. Repeat offenders could face penalties up to $25,000. NewsdayTV's Shari Einhorn has more.  Credit: Newsday/Belisa Morillo, Drew Singh; File Footage

'It's personal to me' The law would require businesses to have proper state licensing, prove that their employees are paid and ban staff from living at the spas or sleeping there overnight. Repeat offenders could face penalties up to $25,000. NewsdayTV's Shari Einhorn has more.

The law would require businesses to have proper state licensing, prove that their employees are paid and ban staff from living at the spas or sleeping there overnight. Repeat offenders could face penalties up to $25,000. NewsdayTV's Shari Einhorn has more.  Credit: Newsday/Belisa Morillo, Drew Singh; File Footage

'It's personal to me' The law would require businesses to have proper state licensing, prove that their employees are paid and ban staff from living at the spas or sleeping there overnight. Repeat offenders could face penalties up to $25,000. NewsdayTV's Shari Einhorn has more.

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