UPDATE: Authorities believe the individual may have been attempting to make mustard gas in the apartment.

Original story below…

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ROSEDALE, MD—Emergency crews are responding to a possible hazardous materials incident at a Rosedale apartment complex.

At around 4:30 p.m., units responded to the 5200-block of Daybrook Circle (21237).

At the scene, firefighters found that an occupant had mixed ammonia and bleach in a third floor apartment in The Apartments at Cambridge Court.

Hazmat teams are reportedly working to evacuate the third floor and all floors above.

There has been no word on any injuries.

Motorists should use caution in the area.

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