U.S. Olympic swimmer Ryan Lochte apologized Friday for his behavior surrounding an incident at a Rio de Janeiro gas station, saying he should have been more “careful and candid” about how he described what happened after a night of partying with his teammates.

But he didn’t explain why he embellished details of an encounter with armed security guards and called it a robbery, and why he omitted to say that he and three teammates had vandalized a gas station restroom.

“Regardless of the behavior of anyone else that night, I should have been much more responsible in how I handled myself and for that am sorry,” Lochte said in a lengthy post on his Instagram account.