The lockdown was announced early Saturday morning. A statement from the Bureau of Prisons does not specify the length of the lockdown but says the agency was securing all of its facilities as a precautionary measure brought on by “current events occurring around the country.”

“In securing the facilities, the hope is that this prudent measure is for a short period and that operations will be restored to their prior status as soon as practical,” the agency said. “We will continue to monitor events carefully and will adjust operations accordingly as the situation continues to evolve.”

The Associated Press reports that the lockdown went into effect at midnight Saturday, after inmates had been secured in their cells for the night. The Bureau of Prisons statement goes on to say that inmates would still be provided with access to email and telephones but that communication with families would be limited.