Diana Nyad began her swim Sunday evening. (Franklin Reyes / AP)

Strong winds and shifting currents forced marathon swimmer Diana Nyad to end her attempt to swim 103 miles from Cuba to the Florida Keys early this morning.

Nyad, 61, chose to end her swim about halfway through because of increasingly rough seas that were taking her off course. A member of her team tweeted that the “combination of factors was too much to safely continue.”

Nyad, who also struggled with shoulder pain and asthma, was taken aboard a boat at about 12:45 a.m. EDT, CNN reported, 29 hours after she entered the water in Havana.

“I am not sad. It was absolutely the right call,” she said. At around 9 a.m., Nyad’s team tweeted that she had arrived in Key West and was awaiting Customs officials before anyone could leave or board the boat.

Realizing the conditions of 5 to 10 knot winds and less than ideal currents, Diana herself decided to end the swim.less than a minute ago via HootSuite Favorite Retweet ReplyDiana Nyad

On her Twitter account, her team wrote: “Earlier in the evening, she was surrounded by dolphins and a beautiful Caribbean sunset. But strong currents blew her 15mph [sic] off course.”

Members of her team reported that she was “aboard the Bellisimo, wrapped in blankets, recovering from the ‘Xtreme Dream.’ ”