A block of flats is closed tonight and a man is arrested after the police have discovered suspects.
Residents in Manchester were evacuated and the crew members scrambled while the substance was being examined.
A man is currently being held on suspicion of making malicious communication.
Policemen were driven to the flats around four o'clock in the afternoon with the locals, who were now worried about when they could be taken home.
A communal area has been opened, but the municipality may have to find a home if residents are blocked for the flats, MEN reports.
Firefighters are currently testing the fabric and a huge cordon is in place.
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Greater Manchester Police said: "The police respond to reports that suspect substances have been found at an address on Hamerton Road in Collyhurst.
"A man has been arrested on suspicion of making malicious communication.
"A cordon is in place and Roach Court flats have been evacuated as a precaution."