Target TGT, +0.65% has experienced a global computer system outage, according to reports on Twitter TWTR, -4.83% . Customers across the country have reported that Target employees were advising them that the retailer's payment system was down, causing long lines to form in many locations. Target did not return a request for comment, but did confirm the outage in replies on social media. "We are aware of a systems issue in store and are working as quickly as possible to get this fixed," the company said on its AskTarget Twitter account.