Under the new guidelines, international non-governmental organizations (NGOs) must provide detailed data about their Palestinian employees. Those who fail to comply with the deadline will be barred from operating in Gaza starting Thursday.

Gilad Zwick, spokesman for the Ministry of Diaspora Affairs and Combating Anti-Semitism, said the names of 37 NGOs had not yet met the requirements. The deadline to submit the information ends at midnight on Wednesday. The ministry said the move is part of Israel’s plan to “strengthen and update” regulations governing international NGOs working in Palestinian areas.

Israel has also singled out Doctors without Borders (MSF), accusing it of employing two people linked to Palestinian militant groups Islamic Jihad and Hamas. MSF has not publicly accepted the allegations. Other organizations facing the ban include the Norwegian Refugee Council, World Vision International, CARE, and Oxfam, according to the list shared by Zwick.

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Several aid groups warned that the new rules could badly affect humanitarian work. They say the amount of aid entering Gaza is already far below what is needed. The European Union (EU) has also raised an alarm. EU humanitarian chief Hadja Lahbib said the decision would block “life-saving” assistance and stressed that international humanitarian law requires aid to reach people in need.

Although a ceasefire deal had allowed for 600 aid trucks per day, NGOs and the United Nations say only 100 to 300 trucks are currently delivering humanitarian supplies. Israel’s COGAT office, however, says an average of 4,200 trucks enter Gaza each week, equal to about 600 per day.