Crews are responding to a hazmat situation in North Reading, Massachusetts.
Fire officials said crews have been at a tennis court outside the Greenbriar Condo Complex on Greenbriar Drive for several hours.
Police were initially called in to handle a disturbance between a man and woman who were arguing. Authorities said one person allegedly threw some type of substance at the other.
The man was then taken into custody on an outstanding warrant.
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Police believe the substance is fentanyl.
No further information was immediately available.