A 14-year-old incoming freshman collapsed during tryouts for the Southern Guilford High School’s cross country team early Thursday morning in Greensboro, North Carolina. Paramedics rushed to the scene and transported her to a local hospital, but they were unable to resuscitate her, the News & Record reported.

Allison Brown, who previously ran track for Southern Guilford Middle School, was nearing the end of a 3.1-mile course by the school’s athletic stadium when she collapsed. Another student witnessed her fall and called for help. EMTs and the school’s athletic trainer quickly began administering CPR before the paramedics arrived, according to Debbie Kraszenski, the principal at Southern Guilford High School.

The cause of her death remained unclear late Thursday evening.

“We are deeply saddened by the loss of this wonderful young woman,” Kraszenski told the News & Record in a press conference. “Anytime anything happens with your students it’s tough.”

Brown had received a physical before tryouts began, Time Warner Cable News reported.

The incident occurred around 9 a.m. on the second day of tryouts. The weather conditions—75 degrees and 88 percent humidity with overcast skies—were within the school’s warm weather guidelines, according to the school’s athletic director, Leigh Hebbard.

“Her dad told me this morning that she was an avid runner and that she was excited about running cross country,” Kraszenski told the News & Record. “As you can imagine, everyone is in deep sorrow, but the community is very strong.”

A memorial for Brown has sprung up near the fence around the stadium.

Alhough school doesn’t start until August 24, grief counselors will be on campus on Friday for students.

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Flower and candle outside track where practice was being held. pic.twitter.com/1Jz0VgTLuP — Kim Wynne (@KimWynneNBC6) August 6, 2015

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