CAIRO: Egyptian Prime Minister Essam Sharaf authorized Minister of Petroleum Abdullah Ghorab to follow up on the explosion of the Egypt-Israel-Jordan gas pipeline, and to estimate the number of casualties. In addition, Sharaf asked Minister of Interior Mansour el-Issawy to order the arrest of the perpetrators as fast as possible and to prepare a comprehensive report about the incident. Unknown masked people last night set fire at the main pipeline that links el-Nagah and el-Medan gas stations in Arish for the seventh time since the beginning of the January 25 Revolution.