Israel's military seized control of the Rafah border crossing in Gaza Tuesday, according to officials.

The Israeli Defense Forces’ (IDF) tanks rolled into the southern city of Gaza, which houses around 1.3 million people early Tuesday.

The seizure of the border crossing, critical for delivering humanitarian aid, comes after militant group Hamas said it would agree to a Qatari-Egyptian cease-fire proposal. However, Israel said the deal was not up to par.

The IDF said its aircraft struck over 50 targets on the Gaza side of Rafah. Israel has faced backlash for its planned incursion into the region, an operation President Biden and his administration warned Israeli Prime Minister Benjamin Netanyahu not to proceed with.

Israel told around 100,000 residents of eastern Rafah to evacuate Monday, a day before Israeli 401st Brigade moved into the crossing, The Associated Press reported. Both Rafah and Kerem Shalom, two major entry points for humanitarian aid into the Gaza Strip, have been shut down the last two days, per the AP.

The United Nations Relief and Works Agency (UNRWA), an agency for Palestinians in Gaza that supplies food and medicine, said Tuesday that it will stay in Rafah despite Israel’s incursion.

“We are staying where we are," the director of planning at UNRWA, Sam Rose, told Al Jazeera English. "The issue is our ability to continue delivering over a sustained period of time if the crossings remain closed."

Overnight, the Israeli military killed 23 Palestinians, according to the AP. In response, Gaza’s Interior Ministry slammed the Israeli military operation in the area and said the crossing does not pose a risk to the IDF.

“The Rafah crossing is a civilian service facility and constitutes the main lifeline for citizens in the Gaza Strip,” the ministry said in a statement Tuesday. “The crossing does not represent any threat to the Israeli occupation."

The war in Gaza, which began on Oct. 7 after Hamas launched strikes on Israel, has driven around 80 percent of the territory’s population from their homes, the AP reported. The death toll in the region has risen to more than 34,500 people, according to local health officials.