JERUSALEM (AP) — An Israeli tank brigade seized control Tuesday of the Gaza Strip side of the Rafah border crossing with Egypt, authorities said, moving forward with an offensive in the southern city even as cease-fire negotiations with Hamas remain on a knife’s edge.

The Israeli 401st Brigade entered the Rafah crossing early Tuesday morning, the Israeli military said, taking “operational control” of the crucial crossing for both aid and those able to flee into Egypt.

Footage released by the Israeli military showed a tank entering the crossing. Details of the video matched known features of the crossing and showed Israeli flags flying from tanks that seized the area.

The Israeli military claimed it seized the crossing after receiving intelligence it was “being used for terrorist purposes.” The military did not provide evidence to immediately support the assertion, though it alleged the area around the crossing had been used to launch a mortar attack that killed four Israeli troops and wounded others near the Kerem Shalom Crossing.

The military also said that ground troops and airstrikes targeted suspected Hamas positions in Rafah.

Wael Abu Omar, a spokesman for the Palestinian Crossings Authority, acknowledged Israeli forces had seized the crossing and had closed the facility for the time being. He said strikes had targeted the area around the crossing since Monday.