In Jharkhand, National Investigation Agency raided the house of a SIMI activist Manzar Imam in Ranchi last night in connection with Mumbai Serial Blast probe. SSP Ranchi Praveen Kumar said that Manzar, however, could not be arrested. He said Ranchi Police will follow up the case. Manzar is wanted in Hyderbad blast case in 2007 and is absconding.