By Rosalie Chan
August 12, 2016

The Olympic diving pool closed briefly Friday morning after turning green.

According to Washington Post reporter Sally Jenkins, dive training was canceled in the morning.

The diving pool at the Maria Lenk Aquatic Center originally turned green on Tuesday ahead of the women’s synchronized diving final. The water polo pool turned green on Wednesday ahead of preliminary tournaments.

Only the women’s three-meter springboard preliminaries were scheduled for Friday. According to Olympic officials, the Maria Lenk Aquatics Center was supposed to open for divers to train at 12pm ET, and the preliminary was expected to take place as scheduled, NBC Olympics reports. Athletes performed dry training while it was shut.

Olympic officials said the green color was caused by a proliferation of algae because of heat and lack of wind, but the color did not affect competition and was not dangerous to athletes. Read more about why the pools turned green here.

Contact us at editors@time.com.

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