ROUND ROCK, Texas (KXAN) -- The Round Rock Police Department said police were actively investigating an officer-involved shooting Tuesday night at southbound I-35 near Westinghouse Road. RRPD said southbound I-35 at Westinghouse Road was shut down just before 11:00 p.m. Tuesday. The public is asked to avoid the area and to seek an alternate route. This is a developing story. Check back with KXAN.com for updates.