An unknown powder was sent to the Connecticut Lottery headquarters in Wallingford on Tuesday.
The powdery substance was found after a piece of mail was opened, prompting a response from local, state and federal officials, according to the Connecticut Lottery Corporation.
Crews conducted environmental testing and found no signs of hazardous materials in the letter, the company said. No injuries were reported.
The headquarters and claims center closed for the rest of the day and was expected to reopen on Wednesday.
“The Connecticut Lottery Corporation is grateful for the swift response and coordination of its law enforcement and public safety partners,” lottery officials said in a statement. “The safety of employees, players, and the public remains the organization’s highest priority.”