KARACHI Tension simmered in various neighbourhoods in Karachi on Friday when unidentified gunmen went on shooting sprees and arsonists set fire to several vehicles ahead of the strike called by the Sindh nationalists on Saturday. The shutter-down strike has been called to protest the restoration of the Sindh Local Government Ordinance 2001. As per reports, unidentified arsonists set two passenger buses on fire in Gulshan-e-Iqbal and Shah Faisal Colony areas. Another bus was set ablaze in Preedy area while a Suzuki pickup was burnt near Ghaghar level-crossing. Commercial activities stood suspended as gunshot reverberated in Empress Market, Saddar, Regal Chowk, Hassan Square, Burns Road, Mashriq Centre, Gulshan-e-Hadeed, Steel Town, Gulistan-e-Johar, Baldia Town, Ittehad Town, Malir and other areas of the provincial metropolis. In the worst incident, two passers-by, Nabeel and Farooq, were wounded near Empress Market when unidentified gunmen shot fires in the air in a bid to force shopkeepers to close down their shops. Heavy contingents of police and other law enforcement agencies were called in. Meanwhile, the Awami National Party, Sunni Tehreek, Jamaat-e-Islami, Jamiat Ulema-e-Islam (JUI) and other religious and political groups have announced to support the strike. Meanwhile, a passenger was burnt to death while half a dozen sustained burn injuries when unidentified arsonists set fire to a passenger bus of route number W-11 near Humayun Centre, Keamari, in the jurisdiction of the Jackson Police Station. Police officials said that the miscreants first threw some highly flammable chemical into the bus and then set it ablaze. As a result, a passenger was burnt to death and six others wounded. Police officials said that the injured were ferried to the Karachi Civil Hospital. In similar incidents, two more buses were set on fire in Orangi and Nazimabad areas. Stones were also lobbed at passing vehicles by unidentified miscreants in various parts of the metropolis.