‘‘We hereby declare that we have begun operating in Palestine,’’ the leaflet distributed in the name of Al-Tawhid and jihad said heaping praises on Al-Qaeda head Osama bin Laden and Abu Musab Zarqawi. ‘‘We have decided to revive the Sunnah (one of the sources of Islamic jurisprudence) of slaughter against these people to avoid dissension,’’ the Jerusalem Post quoted the leaflet circulated in Gaza as saying. This is the first time the group, believed to be headed by Jordanian terrorist Zarqawi, has issued a leaflet in Gaza. A Hamas spokesman denied any connection to the threats, saying they did not...