Police said an Israeli student attending college in Australia was on the phone with her sister, using FaceTime when she was killed in a “horrendous, horrific” attack on Tuesday.

According to the BBC, the body of Aiia Maasarwe, 21, was found Wednesday morning in Melbourne near LaTrobe University. Maasarwe was reportedly last seen getting off a tram near a shopping center late Tuesday night after attending a comedy show.

Police said the student was on the phone with her sister overseas, “who heard the sound of the phone falling to the ground and heard some voices.” The sister called Australian police around the same time Maasarwe’s body was found, according to the network.

Victoria Police said the victim’s body showed signs of being “seriously assaulted.” Mirror reported that the body was partially-naked and found in bushes.  Australia’s ABC News reported that authorities are investigating whether the slain 21-year-old was sexually assaulted.

Investigators believe a T-shirt and cap recovered in bushes about 330 feet from Maasarwe’s body will be crucial in finding her killer. Victoria police detective Andrew Stamper said the attack appears to be “random” and “opportunistic,” according to the BBC.

Seeking leads, police have released CCTV images of Maasarwe at the tram stop Tuesday night.

“Somebody in the community knows who did this. Somebody’s come home on Tuesday night or in the early hours of Wednesday morning, maybe with blood on them, missing items of clothing,” Stamper said. “Somebody knows about this and we need help.”

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[Featured Image: Aiia Maasarwe/Instagram]