 However, on 17 July, the forensic science laboratory Mumbai has confirmed the use of a mixture of the highly explosive RDX and Ammonium Nitrate for the bombings.The presence of these explosives in the post explosive debris was confirmed by modern techniques such as Liquid Chromatography with mass detector (LCMS), Gas Chromatography with mass detector (GCMS) and Ion Scan Chromatography.They have indicated a strong possibility of all explosives being planted at the Churchgate railway station, which was the starting point for all affected trains.