Chandigarh: Shiromani Akali Dal (SAD) leader Bikram Singh Majithia on Wednesday seeks a probe by the National Investigation Agency (NIA) into the grenade blast at the residence of BJP leader Manoranjan Kalia in Jalandhar city. Speaking with the reporters in Jalandhar after visiting the house of Kalia, former minister and ex-Punjab BJP President’s house, Majithia.