Police in Austin, Texas, were preparing to stage a media briefing early Wednesday about an officer-involved shooting, amid local media reports that the Austin bombing suspect had killed himself with an explosive device.

The Austin American-Statesman reported that local police had located the suspect using a mix of cellphone information, security video and store receipts.

Authorities identified the suspect based largely on security video and other evidence gathered when the suspect shipped an explosive device from a FedEx store in Austin, the newspaper reported. They used cellphone technology to trace the suspect to a hotel in Williamson County, a source told the newspaper.

Late Tuesday night an explosion in Austin caused by an “incendiary device” was said to be unrelated to previous bombings in Texas that have killed two people and severely wounded four others since March 2, police and federal authorities said.