Protesters trying to march into Gaza a year after an Israeli offensive are on hunger strike after Egypt blocked them from crossing the border.
Hundreds of people in Cairo have been prevented from getting close to the border with Gaza.
A group who got as far as the Sinai port of El Arish have been detained by the Egyptian police.
A separate convoy of vans delivering medical supplies is stuck in the Jordanian port town of Aqaba.
At least 38 people of various nationalities were picked up by Egyptian security services in El Arish and held in their hotel rooms, AFP news agency reported.
'Whatever it takes'
In Cairo hundreds of activists are camped outside the United Nations mission in Cairo trying to get them to pressure the Egyptians to let them cross the border with the Gaza Strip.
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