Citibank is set to close over 670 branches across the US, causing a 24-hour blackout in the coming days. This means that customers will be unable to access their bank accounts or make changes at physical branch locations during this time. The closure is particularly inconvenient for those planning to visit a branch before the Martin Luther King holiday, as many US banks, including Wells Fargo and Bank of America, will also be shut on this federal holiday. However, it's important to note that this is not an uncommon occurrence, and ATMs will still be available 24/7, depending on building availability. Some retailers, like Costco, will remain open during the holiday, offering discounts and normal business hours. For Citibank, this closure is in addition to other holidays they recognize, such as New Year's Day, President's Day, Memorial Day, Juneteenth, Independence Day, Labor Day, Columbus Day, and Veterans Day. So, if you're planning to visit a Citibank branch or need to make changes to your account, be sure to plan ahead and consider alternative options during this 24-hour blackout period.