Based on the information available, the tweet you are referring to was posted on May 28, 2018, at 11:27 EDT, as indicated by reports from various web sources. The tweet was later deleted, but it was confirmed that Chelsea Manning posted a photo of feet close to the edge of a building with the caption "I'm sorry," which caused concern among her followers. After the concerning posts, an update was made from her account stating that she was safe and on the phone with friends, suggesting that the tweet was indeed posted and then deleted.
>>22447094 lb
>>22447452 lb
>>22447131 lb