Mourners hold Flagstaff vigil for woman killed while a captive of Islamic militants

Palestinian demonstrators hold portraits of Kayla Mueller, a 26-year-old American who died while being held hostage by the Islamic State group, during a weekly demonstration against Israel's separation barrier in the West Bank village of Bilin near Ramallah, Friday, Feb. 13, 2015. Her death was confirmed this week by her family and the U.S. government, but how she died remained unclear. (AP Photo/Majdi Mohammed) (The Associated Press)

Scores turned out to honor a humanitarian worker from Arizona who was killed while being held captive by Islamic State militants.

Saturday night's vigil for Kayla Mueller was at Northern Arizona University in Flagstaff where she studied.

The Arizona Republic reports (http://bit.ly/1CvcoIg ) that about 200 people gathered at a garden.

The tone varied from joyous to somber, and many implored others to take the action Mueller would have done.

Former roommate Emily Schick recalled time she shared with Mueller. Sledding for hours. Road trips to Texas. Kayla practicing French all night long.

The Rev. Kathleen Day, a campus minister and close friend, said the event was also a forum to learn about how to channel that grief.

Her captors claimed she died in an airstrike. The Pentagon rejected that but said it didn't know how she was killed.