Staff Reporter A petition seeking investigation of deaths by toxic gas in Keamari area has been filed in Sindh High Court (SHC). Advocate Abdul Jalil Marwat in his petition made the Karachi Port Trust (KPT), Sindh government and I.G. Police of Sindh parties in the case. Discharge of toxic gas has claimed at least six lives and over 100 people have been affected in the incident, according to the petition. The petition seeks the court order for investigation of the incident to fix the responsibility.