Hamas’ military wing in the Gaza Strip has been transferring tens of thousands of dollars a month to the Islamic State group’s Sinai branch over the past year, via one of its emissaries.

The transfer of cash is just one part of the military and strategic cooperation between the two groups. The finances of Hamas’ military arm, the Izz ad-Din al-Qassam Brigades, are independent of those of the organization’s political bureau.

Hamas is paying the Islamic State militants in Egypt to secure weapons shipments being smuggled through the Sinai to Gaza. […]