Associated with? Could be anyone. The PLO is/was a hydra headed monster with many branches. They are indoctrinated from birth to want to murder Jews. It is in their religion, it is on their television, and it is taught in their schools.
I thought it was strange that no ‘umbrella’ organization was mentioned, but then again, I suppose in many parts of the mideast any group of discontents can decide to form a terror CELL.