Erin - Rickie Fowler is keeping his feet on the ground after a record-equalling start to the US Open saw him grab an early lead in the clubhouse on Thursday. The tweet also revealed that the pilot sustained injuries and that emergency officials were on the scene dealing with the situation.
Spectators posted photos and videos online which appeared to show the blimp falling from the sky and crashing in woodland near the course.
Both the Federal Aviation Administration and the National Transportation Safety Bureau are assisting with the onsite investigation.
TMZ Sports reported that the pilot made it out of the blimp but suffered suffered burns on his face and has pain in his neck and lower back.
Johnson had arrived in Wisconsin as the bookmaker's favourite, with his powerful long game tipped to be ideally suited to what was set up as the longest US Open course in history.
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Mr Christian said the USA withdrawal is not surprising as Mr Trump had made his intentions known earlier. The United States can, and will, meet its commitment under the Paris Agreement ".
The blimp, operated by Florida-based AirSign, was being used for advertising as it floated above the tournament.
The crash happened east of the grounds, in an open field.
The annual golf tournament is in its 117th year and is located in Erin, Wisconsin.
"It started deflating, and then it started going down", witness Bryan Rosine told the Journal-Sentinel.
"You can not play this golf course if you're not in position off the tee, and I wasn't in position", McIlroy said.
The company that owns the blimp is AirSign.
Maynard says he is "not 100 percent" on the condition of the pilot but that believes he is alive.