SYDNEY (AP) — A terror suspect shot dead after he stabbed two Australian counterterrorism police officers may not have been acting alone as originally thought, a lead investigator said Thursday.

Numan Haider, 18, was killed Tuesday after he stabbed two officers during a meeting outside a Melbourne police station. Police initially said Haider appeared to be working on his own, but Victoria Police Chief Commissioner Ken Lay said new information suggests that might not be the case.