Turkish police reported on Thursday that a teenager who killed nine people at a school in Turkey on Wednesday had referenced an American mass murderer in his WhatsApp profile picture. The information was shared by police in a statement cited by AFP from Ankara.

According to the police statement, preliminary investigation found that the perpetrator used a photo mentioning Elliot Rodger on his WhatsApp profile. Rodger was a 22-year-old American who killed six people in California in 2014 before taking his own life. He was reportedly frustrated over being rejected by women.

Authorities have not yet provided further details about the Turkish suspect or the ongoing investigation.