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.
Police believe the substance is fentanyl.
No further information was immediately available.