According to KXAN in Austin, the suspected Austin bomber is dead following an officer-involved shooting on Interstate 35, three law enforcement sources confirm.

The shooting happened on Interstate 35 in Round Rock near Old Settlers Boulevard around 2 a.m. Wednesday.

A law enforcement source says the suspected bomber blew up a device inside a vehicle. Police activity has centered in the parking lot of a Red Roof Inn at 1990 N. I-35, just south of Chisholm Parkway.

Michael Luna, a witness staying at the hotel who is ex-military, tells KXAN the blast sounded like two grenades going off.