As the World Bulletin writes, the rally was organized by "several NGOs."
AHN reports that the organizations that organized the protest included "AKDAV, Aqaba, Civilization Foundation, Human and Civilization Movement, IHH Humanitarian Relief Foundation, Mazlum-Der, Ozgur-Der, Research and Cultural Foundation and Wisdom Foundation."
The photos of the rally from the World Bulletin include Hezbollah flags.
Palestine Today is now publishing photos that show that protesters were also showing their support for Islamic Jihad and other terrorist groups:
The photo on the T-shirt is of Islamic Jihad founder Fathi Shaqaqi.
IHH is recognized by the UNHCR as an NGO. It is also one of the groups supporting the Free Gaza organization, and it has been banned by Israel.