A complex of seven separate facilities now lies outside the regional capital Urumqi.
Fate of injured policemen, suspects unclear amid news blackout and reports of more than 10 killed or injured.
Three more police are believed dead after blast in the basement of a house they were searching in Guma County.
China accuses the trio of being members of the East Turkestan Islamic Movement.
Ilham Tohti is a 'scapegoat' for ethnic tensions and a prisoner of conscience, his advocates say.