Efflorescence is the white powdery substance you might notice on basement walls, concrete surfaces, or masonry materials. It forms when water moves through a porous material like concrete or brick, ...

A suspicious package brought to a Florida Immigration and Customs Enforcement office by a Cuban migrant caused a security guard to fall ill and forced a sudden evacuation of the building Thursday ...

Three people were briefly hospitalized after a "white powdery substance" exploded in a Colorado home on Tuesday. Arapahoe County deputies say a family found a small container on the front porch of ...

First responders in Dallas, including a Hazmat crew, investigated a suspicious substance reported early Friday morning at the Dallas ICE facility near I-35E and Mockingbird Lane. According to Dallas ...

DENVER (KDVR) — South Metro Fire Rescue crews responded to a residence in unincorporated Arapahoe County on Tuesday evening for a hazmat investigation after residents there found a small container on ...

The Secret Service confirmed to Scripps News on Wednesday that a white powdery substance found at the White House was cocaine. The discovery was made on Sunday and prompted an evacuation of the ...

JEFFERSON CITY, Mo. -- The FBI and Postal Service are investigating suspicious mail containing a white powder substance that was sent to election offices in at least 16 states this week, according to ...

Meriden, Conn.-based MidState Medical Center locked down for three hours April 20 after a man entered the hospital’s emergency room with what police said was a white powdery substance on him later ...

Police said a white powdery substance and drug paraphernalia was found in a truck that vaulted onto the I-44 on-ramp and left ...