Karachi, Ramadan 9, 1433, Jul 28, 2012, SPA - Four persons were killed in different incidents of firing and violence, according to a report of Pakistan's "Dunya News" TV. Police arrested two target killers reportedly involved in murder of 18 people and recovered weapons out of their possession. --SPA 13:27 LOCAL TIME 10:27 GMT www.spa.gov.sa/1018589