A six  member National Investigation Agency team arrived Friday at Lethpora, Pulawama the site of  suicide attack and collected samples.  On Thursday, a home ministry official had said an NIA team with forensic experts was being sent to Srinagar to assist Jammu and Kashmir Police in forensic evaluation of the scene of crime.  The death toll  of CRPF in attack had risen to 40.  PM Modi has warned of  strong action.