At least 5 people reportedly being treated for nose bleeds and burning sensations after letter opened on US military base

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• Firefighters and paramedics are responding to a reported incident involving potentially hazardous materials.
• A letter that may have contained hazardous substances was reportedly opened.
• Five people were reportedly being treated for symptoms, including nose bleeds and burning sensations.

Firefighters and paramedics are responding to a potential incident that may have involved hazardous materials in Virginia, according to multiple reports on Tuesday afternoon.

An emergency task force was reportedly called for at around 4:30 p.m. at Joint Base Myer-Henderson Hall after a letter was opened that may have contained a hazardous substance, according to local news company ARLnow. At least five people were reportedly being treated for symptoms that include nose bleeds and burning sensations. 

The building was evacuated and a decontamination station was deployed.

This is a developing situation. Check back for updates.