A Central Reserve Police Force personnel was killed and 17 passengers injured, two of them critically, when suspected Black Widow or Dima Halam Daogah (Jewel Garlosa) militants opened fire at a passenger train at North Cachar Hill district of Assam on Friday afternoon.A senior Northeast Frontier Railway official informed that the Badarpur-Lumding Up Barak Valley Passenger was attacked by militants at Wagrendisa, before reaching the Maibong railway station.