The contentious Israeli-backed group distributing food in Gaza closed its sites on Wednesday, a day after Palestinians trying to get supplies came under Israeli fire near one of the organization’s aid centers.

The group, the Gaza Humanitarian Foundation, said that its four centers would be shut until Thursday to work on “organization and efficiency” to better prepare for the huge numbers of Palestinians who have traveled to the sites since operations began more than a week ago.

The foundation added that Israeli troops were doing their own preparations along access roads leading to the distribution centers, without specifying what that entailed.

The Israeli military warned Palestinians not to approach the sites or the adjacent roads, saying that they were now considered “combat zones.”

The pause in operations followed days in which dozens of Palestinians trying to reach one of the foundation’s sites in the southern Gaza city of Rafah were killed after coming under fire, according to local health workers.

On Tuesday, the Red Cross and Gaza health officials said that at least 27 people had died in the second large-scale deadly shooting in recent days. The Gaza Humanitarian Foundation said that a number of civilians had been injured and killed in an area outside the site but did not provide a number.